diff --git a/.github/mergify.yml b/.github/mergify.yml
index c01839d05ca..687cbfcfc55 100644
--- a/.github/mergify.yml
+++ b/.github/mergify.yml
@@ -5,7 +5,7 @@ queue_rules:
     allow_inplace_checks: True
     allow_checks_interruption: False
     speculative_checks: 1
-    batch_size: 5
+    batch_size: 8
     # Wait a short time to embark hotfixes together in a merge train
     batch_max_wait_time: "2 minutes"
     conditions:
@@ -18,9 +18,9 @@ queue_rules:
     allow_inplace_checks: True
     allow_checks_interruption: True
     speculative_checks: 1
-    batch_size: 5
+    batch_size: 20
     # Wait for a few minutes to embark high priority tickets together in a merge train
-    batch_max_wait_time: "5 minutes"
+    batch_max_wait_time: "10 minutes"
     conditions:
       - base=main
 
@@ -28,9 +28,9 @@ queue_rules:
     allow_inplace_checks: True
     allow_checks_interruption: True
     speculative_checks: 1
-    batch_size: 5
+    batch_size: 20
     # Wait a bit longer to embark low priority tickets together in a merge train
-    batch_max_wait_time: "10 minutes"
+    batch_max_wait_time: "20 minutes"
     conditions:
       - base=main
 
@@ -85,4 +85,4 @@ pull_request_rules:
     actions:
       queue:
         name: low
-        method: squash
\ No newline at end of file
+        method: squash
diff --git a/.github/workflows/build-crates-individually.patch.yml b/.github/workflows/build-crates-individually.patch.yml
index f78e69a2731..2fdc44905ac 100644
--- a/.github/workflows/build-crates-individually.patch.yml
+++ b/.github/workflows/build-crates-individually.patch.yml
@@ -10,6 +10,9 @@ on:
       # dependencies
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      # configuration files
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       # workflow definitions
       - '.github/workflows/build-crates-individually.yml'
 
diff --git a/.github/workflows/build-crates-individually.yml b/.github/workflows/build-crates-individually.yml
index 4e65f6b8ad8..57b25707fe1 100644
--- a/.github/workflows/build-crates-individually.yml
+++ b/.github/workflows/build-crates-individually.yml
@@ -11,6 +11,9 @@ on:
       # dependencies
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      # configuration files
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       # workflow definitions
       - '.github/workflows/build-crates-individually.yml'
   pull_request:
@@ -20,11 +23,15 @@ on:
       # dependencies
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      # configuration files
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       # workflow definitions
       - '.github/workflows/build-crates-individually.yml'
 
 env:
   CARGO_INCREMENTAL: 0
+  RUST_LOG: info
   RUST_BACKTRACE: full
   RUST_LIB_BACKTRACE: full
   COLORBT_SHOW_HIDDEN: '1'
@@ -48,11 +55,11 @@ jobs:
       # This step is meant to dynamically create a JSON containing the values of each crate
       # available in this repo in the root directory. We use `cargo tree` to accomplish this task.
       #
-      # The result from `cargo tree` is then transform to JSON values between double quotes, 
+      # The result from `cargo tree` is then transform to JSON values between double quotes,
       # and separated by commas, then added to a `crates.txt` and assigned to a $JSON_CRATES variable.
       #
       # A JSON object is created and assigned to a $MATRIX variable, which is use to create an output
-      # named `matrix`, which is then used as the input in following steps, 
+      # named `matrix`, which is then used as the input in following steps,
       # using ` ${{ fromJson(needs.matrix.outputs.matrix) }}`
       - id: set-matrix
         name: Dynamically build crates JSON
@@ -104,7 +111,7 @@ jobs:
 
         # We could use `features: ['', '--all-features', '--no-default-features']` as a matrix argument,
         # but it's faster to run these commands sequentially, so they can re-use the local cargo cache.
-        # 
+        #
         # Some Zebra crates do not have any features, and most don't have any default features.
       - name: Build ${{ matrix.crate }} crate with no default features
         uses: actions-rs/cargo@v1.0.3
diff --git a/.github/workflows/build-docker-image.yml b/.github/workflows/build-docker-image.yml
index 818cbaa50d8..665a3fee61b 100644
--- a/.github/workflows/build-docker-image.yml
+++ b/.github/workflows/build-docker-image.yml
@@ -36,12 +36,20 @@ on:
       rust_log:
         required: false
         type: string
+        default: info
+    outputs:
+      image_digest:
+        description: 'The image digest to be used on a caller workflow'
+        value: ${{ jobs.build.outputs.image_digest }}
 
 jobs:
   build:
     name: Build images
     timeout-minutes: 210
     runs-on: ubuntu-latest
+    outputs:
+      image_digest: ${{ steps.docker_build.outputs.digest }}
+      image_name: ${{ fromJSON(steps.docker_build.outputs.metadata)['image.name'] }}
     permissions:
       contents: 'read'
       id-token: 'write'
@@ -66,12 +74,12 @@ jobs:
           # generate Docker tags based on the following events/attributes
           tags: |
             type=schedule
+            type=sha
             type=ref,event=branch
             type=ref,event=pr
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
-            type=sha
 
       # Setup Docker Buildx to allow use of docker cache layers from GH
       - name: Set up Docker Buildx
@@ -82,6 +90,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
diff --git a/.github/workflows/continous-delivery.yml b/.github/workflows/continous-delivery.yml
index 7bb1bb17bee..b896d1ce2aa 100644
--- a/.github/workflows/continous-delivery.yml
+++ b/.github/workflows/continous-delivery.yml
@@ -14,6 +14,9 @@ on:
   push:
     branches:
       - main
+  release:
+    types:
+      - published
 
 env:
   NETWORK: Mainnet
@@ -23,6 +26,36 @@ env:
   MACHINE_TYPE: c2-standard-4
 
 jobs:
+  # If a release was made we want to extract the first part of the semver from the
+  # tag_name
+  #
+  # Generate the following output to pass to subsequent jobs
+  # - If our semver is `v1.3.0` the resulting output from this job would be `v1`
+  #
+  # Note: We just use the first part of the version to replace old instances, and change
+  # it when a major version is released, to keep a segregation between new and old 
+  # versions.
+  versioning:
+    name: Versioning
+    runs-on: ubuntu-latest
+    outputs:
+      major_version: ${{ steps.set.outputs.major_version }}
+    steps:
+      - name: Getting Zebrad Version
+        id: get
+        uses: actions/github-script@v6.1.0
+        with:
+          result-encoding: string
+          script: |
+            return context.payload.release.tag_name.substring(0,2)
+      - name: Setting API Version
+        id: set
+        run: echo "::set-output name=major_version::${{ steps.get.outputs.result }}"
+
+  # Each time this workflow is executed, a build will be triggered to create a new image
+  # with the corresponding tags using information from Git
+  #
+  # The image will be commonly named `zebrad:<short-hash | github-ref | semver>`
   build:
     uses: ./.github/workflows/build-docker-image.yml
     with:
@@ -35,15 +68,26 @@ jobs:
       zebra_skip_ipv6_tests: '1'
       rust_log: info
 
+  # This jobs handles the deployment of a Managed Instance Group (MiG) with 2 nodes in
+  # the us-central1 region. Two different groups of MiGs are deployed one for pushes to
+  # the main branch and another for version releases of Zebra
+  #
+  # Once this workflow is triggered the previous MiG is replaced, on pushes to main its
+  # always replaced, and with releases its only replaced if the same major version is
+  # being deployed, otherwise a new major version is deployed
+  #
+  # Runs:
+  # - on every push/merge to the `main` branch
+  # - on every release, when it's published
   deploy-nodes:
     name: Deploy Mainnet nodes
-    needs: build
+    needs: [ build, versioning ]
     runs-on: ubuntu-latest
     timeout-minutes: 30
     permissions:
       contents: 'read'
       id-token: 'write'
-    if: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
+    if: ${{ (github.event_name == 'push' && github.ref_name == 'main') || github.event_name == 'release' }}
 
     steps:
       - name: Inject slug/short variables
@@ -56,15 +100,16 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
 
       - name: Create instance template
         run: |
-          gcloud compute instance-templates create-with-container zebrad-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }} \
+          gcloud compute instance-templates create-with-container zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }} \
           --boot-disk-type=pd-ssd \
-          --container-image ${{ env.GAR_BASE }}/${{ env.GITHUB_REF_SLUG_URL }}:${{ env.GITHUB_SHA_SHORT }} \
+          --container-image ${{ env.GAR_BASE }}/zebrad@${{ needs.build.outputs.image_digest }} \
           --create-disk name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }},auto-delete=yes,size=100GB,type=pd-ssd \
           --container-mount-disk mount-path="/zebrad-cache",name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }} \
           --machine-type ${{ env.MACHINE_TYPE }} \
@@ -76,15 +121,15 @@ jobs:
         id: does-group-exist
         continue-on-error: true
         run: |
-          gcloud compute instance-groups list | grep "zebrad-${{ env.GITHUB_REF_SLUG_URL }}" | grep "${{ env.REGION }}"
+          gcloud compute instance-groups list | grep "zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}" | grep "${{ env.REGION }}"
 
       # Deploy new managed instance group using the new instance template
       - name: Create managed instance group
         if: steps.does-group-exist.outcome == 'failure'
         run: |
           gcloud compute instance-groups managed create \
-          "zebrad-${{ env.GITHUB_REF_SLUG_URL }}" \
-          --template "zebrad-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
+          "zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}" \
+          --template "zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
           --health-check zebrad-tracing-filter \
           --initial-delay 30 \
           --region "${{ env.REGION }}" \
@@ -95,10 +140,17 @@ jobs:
         if: steps.does-group-exist.outcome == 'success'
         run: |
           gcloud compute instance-groups managed rolling-action start-update \
-          "zebrad-${{ env.GITHUB_REF_SLUG_URL }}" \
-          --version template="zebrad-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
+          "zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}" \
+          --version template="zebrad-${{ needs.versioning.outputs.major_version || env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
           --region "${{ env.REGION }}"
 
+  # This jobs handles the deployment of a single node (1) in the us-central1-a zone
+  # when an instance is required to test a specific commit
+  #
+  # Runs:
+  # - on request, using workflow_dispatch with regenerate-disks
+  #
+  # Note: this instances are not automatically replaced or deleted
   deploy-instance:
     name: Deploy single instance
     needs: build
@@ -120,6 +172,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -132,7 +185,7 @@ jobs:
           --boot-disk-type=pd-ssd \
           --container-stdin \
           --container-tty \
-          --container-image ${{ env.GAR_BASE }}/${{ env.GITHUB_REF_SLUG_URL }}:${{ env.GITHUB_SHA_SHORT }} \
+          --container-image ${{ env.GAR_BASE }}/zebrad@${{ needs.build.outputs.image_digest }} \
           --create-disk name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }},auto-delete=yes,size=100GB,type=pd-ssd \
           --container-mount-disk mount-path='/zebrad-cache',name=zebrad-cache-${{ env.GITHUB_SHA_SHORT }} \
           --machine-type ${{ env.MACHINE_TYPE }} \
diff --git a/.github/workflows/continous-integration-docker.patch.yml b/.github/workflows/continous-integration-docker.patch.yml
index b96f03e6b01..3f4bd9b3897 100644
--- a/.github/workflows/continous-integration-docker.patch.yml
+++ b/.github/workflows/continous-integration-docker.patch.yml
@@ -14,6 +14,9 @@ on:
       # dependencies
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      # configuration files
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       # workflow definitions
       - 'docker/**'
       - '.github/workflows/continous-integration-docker.yml'
diff --git a/.github/workflows/continous-integration-docker.yml b/.github/workflows/continous-integration-docker.yml
index 14fdd108d4a..6fc73bf7773 100644
--- a/.github/workflows/continous-integration-docker.yml
+++ b/.github/workflows/continous-integration-docker.yml
@@ -33,6 +33,9 @@ on:
       # dependencies
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      # configuration files
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       # workflow definitions
       - 'docker/**'
       - '.github/workflows/continous-integration-docker.yml'
@@ -87,6 +90,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -329,11 +333,10 @@ jobs:
       test_description: Test syncing to tip with a Zebra tip state
       test_variables: '-e TEST_UPDATE_SYNC=1 -e ZEBRA_FORCE_USE_COLOR=1 -e ZEBRA_CACHED_STATE_DIR=/var/cache/zebrad-cache'
       needs_zebra_state: true
-      # TODO: do we want to update the disk on every PR, to increase CI speed?
-      saves_to_disk: false
+      # update the disk on every PR, to increase CI speed
+      saves_to_disk: true
       disk_suffix: tip
       root_state_path: '/var/cache'
-      # TODO: do we also want to test the `zebrad` part of the `lwd-cache`? (But not update it.)
       zebra_state_dir: 'zebrad-cache'
 
   # Test that Zebra can answer a synthetic RPC call, using a cached Zebra tip state
@@ -402,7 +405,6 @@ jobs:
     # to also run on Mergify head branches,
     # add `|| (github.event_name == 'push' && startsWith(github.head_ref, 'mergify/merge-queue/'))`:
     # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#running-your-workflow-based-on-the-head-or-base-branch-of-a-pull-request-1
-    # TODO: this test is unreliable, in the meanwhile we'll only generate a new lwd cached state when a full sync is also triggered
     if: ${{ (!cancelled() && !failure() && github.event.inputs.regenerate-disks != 'true' && github.event.inputs.run-full-sync != 'true') || !fromJSON(needs.get-available-disks.outputs.lwd_tip_disk) }}
     with:
       app_name: lightwalletd
@@ -437,8 +439,8 @@ jobs:
       test_variables: '-e TEST_LWD_UPDATE_SYNC=1 -e ZEBRA_TEST_LIGHTWALLETD=1 -e ZEBRA_FORCE_USE_COLOR=1 -e ZEBRA_CACHED_STATE_DIR=/var/cache/zebrad-cache -e LIGHTWALLETD_DATA_DIR=/var/cache/lwd-cache'
       needs_zebra_state: true
       needs_lwd_state: true
-      # TODO: do we want to update the disk on every PR, to increase CI speed?
-      saves_to_disk: false
+      # update the disk on every PR, to increase CI speed
+      saves_to_disk: true
       disk_prefix: lwd-cache
       disk_suffix: tip
       root_state_path: '/var/cache'
diff --git a/.github/workflows/continous-integration-os.patch.yml b/.github/workflows/continous-integration-os.patch.yml
index ef965a6433a..8f9018b52d2 100644
--- a/.github/workflows/continous-integration-os.patch.yml
+++ b/.github/workflows/continous-integration-os.patch.yml
@@ -9,6 +9,8 @@ on:
       - '**/Cargo.toml'
       - '**/Cargo.lock'
       - '**/deny.toml'
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       - '.github/workflows/continous-integration-os.yml'
 
 jobs:
diff --git a/.github/workflows/continous-integration-os.yml b/.github/workflows/continous-integration-os.yml
index 18614b51c64..0bf90b8daab 100644
--- a/.github/workflows/continous-integration-os.yml
+++ b/.github/workflows/continous-integration-os.yml
@@ -17,6 +17,9 @@ on:
       # dependencies
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      # configuration files
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       # workflow definitions
       - '.github/workflows/ci.yml'
   pull_request:
@@ -36,6 +39,7 @@ on:
 
 env:
   CARGO_INCREMENTAL: 0
+  RUST_LOG: info
   RUST_BACKTRACE: full
   RUST_LIB_BACKTRACE: full
   COLORBT_SHOW_HIDDEN: '1'
@@ -54,11 +58,14 @@ jobs:
         # TODO: Windows was removed for now, see https://github.com/ZcashFoundation/zebra/issues/3801
         os: [ubuntu-latest, macos-latest]
         rust: [stable, beta]
+        exclude:
+        # TODO: re-enable beta Rust tests on ubuntu (#4929)
+          - os: ubuntu-latest
+            rust: beta
         # We're excluding macOS for the following reasons:
         # - the concurrent macOS runner limit is much lower than the Linux limit
         # - macOS is slower than Linux, and shouldn't have a build or test difference with Linux
         # - macOS is a second-tier Zebra support platform
-        exclude:
           - os: macos-latest
             rust: beta
 
diff --git a/.github/workflows/coverage.patch.yml b/.github/workflows/coverage.patch.yml
index fdf9a5f6a7a..241f92e73e5 100644
--- a/.github/workflows/coverage.patch.yml
+++ b/.github/workflows/coverage.patch.yml
@@ -8,6 +8,9 @@ on:
       - '**/*.snap'
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      # configuration files
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       - 'codecov.yml'
       - '.github/workflows/coverage.yml'
 
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index cfa4e03708d..230afd6847e 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -15,6 +15,9 @@ on:
       # dependencies
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      # configuration files
+      - '.cargo/config.toml'
+      - '**/clippy.toml'
       # workflow definitions
       - 'codecov.yml'
       - '.github/workflows/coverage.yml'
@@ -30,6 +33,7 @@ on:
 
 env:
   CARGO_INCREMENTAL: 0
+  RUST_LOG: info
   RUST_BACKTRACE: full
   RUST_LIB_BACKTRACE: full
   COLORBT_SHOW_HIDDEN: '1'
diff --git a/.github/workflows/delete-gcp-resources.yml b/.github/workflows/delete-gcp-resources.yml
index 6cb58f7a857..44a994b347c 100644
--- a/.github/workflows/delete-gcp-resources.yml
+++ b/.github/workflows/delete-gcp-resources.yml
@@ -18,6 +18,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
diff --git a/.github/workflows/deploy-gcp-tests.yml b/.github/workflows/deploy-gcp-tests.yml
index 54c7899879c..2a062cbf709 100644
--- a/.github/workflows/deploy-gcp-tests.yml
+++ b/.github/workflows/deploy-gcp-tests.yml
@@ -59,6 +59,12 @@ on:
         required: false
         type: boolean
         description: 'Does the test use Lightwalletd and Zebra cached state?'
+      # main branch states can be outdated and slower, but they can also be more reliable
+      prefer_main_cached_state:
+        required: false
+        type: boolean
+        default: false
+        description: 'Does the test prefer to use a main branch cached state?'
       saves_to_disk:
         required: true
         type: boolean
@@ -120,6 +126,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -129,9 +136,9 @@ jobs:
         id: create-instance
         run: |
           gcloud compute instances create-with-container "${{ inputs.test_id }}-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
-          --boot-disk-size 100GB \
+          --boot-disk-size 200GB \
           --boot-disk-type pd-ssd \
-          --create-disk name="${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }}",device-name="${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }}",size=100GB,type=pd-ssd \
+          --create-disk name="${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }}",device-name="${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }}",size=200GB,type=pd-ssd \
           --container-image debian:buster \
           --container-restart-policy=never \
           --machine-type ${{ env.MACHINE_TYPE }} \
@@ -141,6 +148,9 @@ jobs:
           --zone ${{ env.ZONE }}
           sleep 60
 
+      # Create a docker volume with the new disk we just created.
+      #
+      # SSH into the just created VM, and create a docker volume with the newly created disk.
       - name: Create ${{ inputs.test_id }} Docker volume
         run: |
           gcloud compute ssh \
@@ -150,7 +160,7 @@ jobs:
           --ssh-flag="-o ServerAliveInterval=5" \
           --command \
           "\
-          sudo mkfs.ext4 /dev/sdb \
+          sudo mkfs.ext4 -v /dev/sdb \
           && \
           docker volume create --driver local --opt type=ext4 --opt device=/dev/sdb \
           ${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }} \
@@ -187,6 +197,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -241,6 +252,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -256,7 +268,10 @@ jobs:
       # - To ${{ inputs.zebra_state_dir || inputs.disk_prefix }} if not
       #
       # If there are multiple disks:
-      # - prefer images generated from this branch, then the `main` branch, then any other branch
+      # - prefer images generated from this branch and commit, then
+      # - if prefer_main_cached_state is true, prefer images from the `main` branch, then
+      # - use images from any other branch.
+      # Within each of these categories:
       # - prefer newer images to older images
       #
       # Passes the disk name to subsequent steps using $CACHED_DISK_NAME env variable
@@ -273,33 +288,53 @@ jobs:
               DISK_PREFIX=${{ inputs.zebra_state_dir || inputs.disk_prefix }}
           fi
 
-          # Try to find an image generated from this branch and commit
-          # Fields are listed in the "Create image from state disk" step
-          BRANCH_DISK_NAME="${DISK_PREFIX}-${GITHUB_REF_SLUG_URL}-${GITHUB_SHA_SHORT}-v${LOCAL_STATE_VERSION}-${NETWORK}-${{ inputs.disk_suffix }}"
-          CACHED_DISK_NAME=$(gcloud compute images list --filter="name~${BRANCH_DISK_NAME}" --format="value(NAME)" --sort-by=~creationTimestamp --limit=1)
-          echo "${GITHUB_REF_SLUG_URL}-${GITHUB_SHA_SHORT} Disk: $CACHED_DISK_NAME"
+          # Try to find an image generated from a previous step or run of this commit.
+          # Fields are listed in the "Create image from state disk" step.
+          #
+          # We can't match the full branch name here,
+          # because it might have been shortened for the image.
+          #
+          # The probability of two matching short commit hashes within the same month is very low.
+          COMMIT_DISK_PREFIX="${DISK_PREFIX}-.+-${{ env.GITHUB_SHA_SHORT }}-v${LOCAL_STATE_VERSION}-${NETWORK}-${{ inputs.disk_suffix }}"
+          COMMIT_CACHED_DISK_NAME=$(gcloud compute images list --filter="name~${COMMIT_DISK_PREFIX}" --format="value(NAME)" --sort-by=~creationTimestamp --limit=1)
+          echo "${GITHUB_REF_SLUG_URL}-${{ env.GITHUB_SHA_SHORT }} Disk: $COMMIT_CACHED_DISK_NAME"
+          if [[ -n "$COMMIT_CACHED_DISK_NAME" ]]; then
+              echo "Description: $(gcloud compute images describe $COMMIT_CACHED_DISK_NAME --format='value(DESCRIPTION)')"
+          fi
 
-          if [[ -z "$CACHED_DISK_NAME" ]]; then
-              # Try to find an image generated from the main branch
-              CACHED_DISK_NAME=$(gcloud compute images list --filter="name~${DISK_PREFIX}-main-[0-9a-f]+-v${LOCAL_STATE_VERSION}-${NETWORK}-${{ inputs.disk_suffix }}" --format="value(NAME)" --sort-by=~creationTimestamp --limit=1)
-              echo "main Disk: $CACHED_DISK_NAME"
+          # Try to find an image generated from the main branch
+          MAIN_CACHED_DISK_NAME=$(gcloud compute images list --filter="name~${DISK_PREFIX}-main-[0-9a-f]+-v${LOCAL_STATE_VERSION}-${NETWORK}-${{ inputs.disk_suffix }}" --format="value(NAME)" --sort-by=~creationTimestamp --limit=1)
+          echo "main Disk: $MAIN_CACHED_DISK_NAME"
+          if [[ -n "$MAIN_CACHED_DISK_NAME" ]]; then
+              echo "Description: $(gcloud compute images describe $MAIN_CACHED_DISK_NAME --format='value(DESCRIPTION)')"
           fi
 
+          # Try to find an image generated from any other branch
+          ANY_CACHED_DISK_NAME=$(gcloud compute images list --filter="name~${DISK_PREFIX}-.+-[0-9a-f]+-v${LOCAL_STATE_VERSION}-${NETWORK}-${{ inputs.disk_suffix }}" --format="value(NAME)" --sort-by=~creationTimestamp --limit=1)
+          echo "any branch Disk: $ANY_CACHED_DISK_NAME"
+          if [[ -n "$ANY_CACHED_DISK_NAME" ]]; then
+              echo "Description: $(gcloud compute images describe $ANY_CACHED_DISK_NAME --format='value(DESCRIPTION)')"
+          fi
+
+          # Select a cached disk based on the job settings
+          CACHED_DISK_NAME="$COMMIT_CACHED_DISK_NAME"
+          if [[ -z "$CACHED_DISK_NAME" ]] && [[ "${{ inputs.prefer_main_cached_state }}" == "true" ]]; then
+              echo "Preferring main branch cached state to other branches..."
+              CACHED_DISK_NAME="$MAIN_CACHED_DISK_NAME"
+          fi
           if [[ -z "$CACHED_DISK_NAME" ]]; then
-              # Try to find an image generated from any other branch
-              CACHED_DISK_NAME=$(gcloud compute images list --filter="name~${DISK_PREFIX}-.+-[0-9a-f]+-v${LOCAL_STATE_VERSION}-${NETWORK}-${{ inputs.disk_suffix }}" --format="value(NAME)" --sort-by=~creationTimestamp --limit=1)
-              echo "any branch Disk: $CACHED_DISK_NAME"
+              CACHED_DISK_NAME="$ANY_CACHED_DISK_NAME"
           fi
 
           if [[ -z "$CACHED_DISK_NAME" ]]; then
               echo "No cached state disk available"
-              echo "Expected ${BRANCH_DISK_NAME}"
-              echo "Also searched for any commit on main, and any commit on any branch"
+              echo "Expected ${COMMIT_DISK_PREFIX}"
+              echo "Also searched for cached disks from other branches"
               echo "Cached state test jobs must depend on the cached state rebuild job"
               exit 1
           fi
 
-          echo "Description: $(gcloud compute images describe $CACHED_DISK_NAME --format='value(DESCRIPTION)')"
+          echo "Selected Disk: $CACHED_DISK_NAME"
 
           echo "STATE_VERSION=$LOCAL_STATE_VERSION" >> $GITHUB_ENV
           echo "CACHED_DISK_NAME=$CACHED_DISK_NAME" >> $GITHUB_ENV
@@ -310,9 +345,9 @@ jobs:
         id: create-instance
         run: |
           gcloud compute instances create-with-container "${{ inputs.test_id }}-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}" \
-          --boot-disk-size 100GB \
+          --boot-disk-size 200GB \
           --boot-disk-type pd-ssd \
-          --create-disk image=${{ env.CACHED_DISK_NAME }},name="${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }}",device-name="${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }}",size=100GB,type=pd-ssd \
+          --create-disk image=${{ env.CACHED_DISK_NAME }},name="${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }}",device-name="${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }}",size=200GB,type=pd-ssd \
           --container-image debian:buster \
           --container-restart-policy=never \
           --machine-type ${{ env.MACHINE_TYPE }} \
@@ -324,7 +359,10 @@ jobs:
 
       # Create a docker volume with the selected cached state.
       #
-      # SSH into the just created VM, and create a docker volume with the recently attached disk.
+      # SSH into the just created VM, expand the partition and filesystem to fill the entire disk,
+      # then create a docker volume with the recently attached disk.
+      # (The cached state and disk are usually the same size,
+      # but the cached state can be smaller if we just increased the disk size.)
       - name: Create ${{ inputs.test_id }} Docker volume
         run: |
           gcloud compute ssh \
@@ -334,6 +372,10 @@ jobs:
           --ssh-flag="-o ServerAliveInterval=5" \
           --command \
           "\
+          sudo e2fsck -v -f -p /dev/sdb \
+          && \
+          sudo resize2fs -p /dev/sdb \
+          && \
           docker volume create --driver local --opt type=ext4 --opt device=/dev/sdb \
           ${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }} \
           "
@@ -369,6 +411,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -494,6 +537,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -502,6 +546,9 @@ jobs:
       # following until Sapling activation (or the test finishes).
       #
       # The log pipeline ignores the exit status of `docker logs`.
+      # It also ignores the expected 'broken pipe' error from `tee`,
+      # which happens when `grep` finds a matching output and moves on to the next job.
+      #
       # Errors in the tests are caught by the final test status job.
       - name: Show logs for ${{ inputs.test_id }} test (sprout)
         run: |
@@ -518,7 +565,12 @@ jobs:
           ${{ inputs.test_id }} | \
           tee --output-error=exit /dev/stderr | \
           grep --max-count=1 --extended-regexp --color=always \
-          '(estimated progress.*network_upgrade.*=.*Sapling)|(estimated progress.*network_upgrade.*=.*Blossom)|(estimated progress.*network_upgrade.*=.*Heartwood)|(estimated progress.*network_upgrade.*=.*Canopy)|(estimated progress.*network_upgrade.*=.*Nu5)|(test result:.*finished in)' \
+          -e 'estimated progress.*network_upgrade.*=.*Sapling' \
+          -e 'estimated progress.*network_upgrade.*=.*Blossom' \
+          -e 'estimated progress.*network_upgrade.*=.*Heartwood' \
+          -e 'estimated progress.*network_upgrade.*=.*Canopy' \
+          -e 'estimated progress.*network_upgrade.*=.*Nu5' \
+          -e 'test result:.*finished in' \
           "
 
   # follow the logs of the test we just launched, up to Canopy activation (or the test finishing)
@@ -552,6 +604,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -572,7 +625,9 @@ jobs:
           ${{ inputs.test_id }} | \
           tee --output-error=exit /dev/stderr | \
           grep --max-count=1 --extended-regexp --color=always \
-          '(estimated progress.*network_upgrade.*=.*Canopy)|(estimated progress.*network_upgrade.*=.*Nu5)|(test result:.*finished in)' \
+          -e 'estimated progress.*network_upgrade.*=.*Canopy' \
+          -e 'estimated progress.*network_upgrade.*=.*Nu5' \
+          -e 'test result:.*finished in' \
           "
 
   # follow the logs of the test we just launched, up to NU5 activation (or the test finishing)
@@ -606,6 +661,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -626,13 +682,14 @@ jobs:
           ${{ inputs.test_id }} | \
           tee --output-error=exit /dev/stderr | \
           grep --max-count=1 --extended-regexp --color=always \
-          '(estimated progress.*network_upgrade.*=.*Nu5)|(test result:.*finished in)' \
+          -e 'estimated progress.*network_upgrade.*=.*Nu5' \
+          -e 'test result:.*finished in' \
           "
 
-  # follow the logs of the test we just launched, up to block 1,740,000 (or the test finishing)
+  # follow the logs of the test we just launched, up to block 1,740,000 or later
+  # (or the test finishing)
   #
   # We chose this height because it was about 5 hours into the NU5 sync, at the end of July 2022.
-  # This is a temporary workaround until we improve sync speeds.
   logs-1740k:
     name: Log ${{ inputs.test_id }} test (1740k)
     needs: [ logs-canopy ]
@@ -663,6 +720,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -683,13 +741,77 @@ jobs:
           ${{ inputs.test_id }} | \
           tee --output-error=exit /dev/stderr | \
           grep --max-count=1 --extended-regexp --color=always \
-          '(estimated progress.*current_height.*=.*174[0-9][0-9][0-9][0-9].*remaining_sync_blocks)|(test result:.*finished in)' \
+          -e 'estimated progress.*current_height.*=.*17[4-9][0-9][0-9][0-9][0-9].*remaining_sync_blocks' \
+          -e 'estimated progress.*current_height.*=.*1[8-9][0-9][0-9][0-9][0-9][0-9].*remaining_sync_blocks' \
+          -e 'estimated progress.*current_height.*=.*2[0-9][0-9][0-9][0-9][0-9][0-9].*remaining_sync_blocks' \
+          -e 'test result:.*finished in' \
+          "
+
+  # follow the logs of the test we just launched, up to block 1,760,000 or later
+  # (or the test finishing)
+  #
+  # We chose this height because it was about 9 hours into the NU5 sync, at the end of August 2022.
+  logs-1760k:
+    name: Log ${{ inputs.test_id }} test (1760k)
+    needs: [ logs-1740k ]
+    # If the previous job fails, we still want to show the logs.
+    if: ${{ !cancelled() }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: 'read'
+      id-token: 'write'
+    steps:
+      - uses: actions/checkout@v3.0.2
+        with:
+          persist-credentials: false
+          fetch-depth: '2'
+
+      - name: Inject slug/short variables
+        uses: rlespinasse/github-slug-action@v4
+        with:
+          short-length: 7
+
+      - name: Downcase network name for disks
+        run: |
+          NETWORK_CAPS=${{ inputs.network }}
+          echo "NETWORK=${NETWORK_CAPS,,}" >> $GITHUB_ENV
+
+      # Setup gcloud CLI
+      - name: Authenticate to Google Cloud
+        id: auth
+        uses: google-github-actions/auth@v0.8.0
+        with:
+          retries: '3'
+          workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
+          service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
+          token_format: 'access_token'
+
+      # Show recent logs, following until block 1,760,000 (or the test finishes)
+      - name: Show logs for ${{ inputs.test_id }} test (1760k)
+        run: |
+          gcloud compute ssh \
+          ${{ inputs.test_id }}-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }} \
+          --zone ${{ env.ZONE }} \
+          --quiet \
+          --ssh-flag="-o ServerAliveInterval=5" \
+          --command \
+          "\
+          docker logs \
+          --tail all \
+          --follow \
+          ${{ inputs.test_id }} | \
+          tee --output-error=exit /dev/stderr | \
+          grep --max-count=1 --extended-regexp --color=always \
+          -e 'estimated progress.*current_height.*=.*17[6-9][0-9][0-9][0-9][0-9].*remaining_sync_blocks' \
+          -e 'estimated progress.*current_height.*=.*1[8-9][0-9][0-9][0-9][0-9][0-9].*remaining_sync_blocks' \
+          -e 'estimated progress.*current_height.*=.*2[0-9][0-9][0-9][0-9][0-9][0-9].*remaining_sync_blocks' \
+          -e 'test result:.*finished in' \
           "
 
   # follow the logs of the test we just launched, up to the last checkpoint (or the test finishing)
   logs-checkpoint:
     name: Log ${{ inputs.test_id }} test (checkpoint)
-    needs: [ logs-1740k ]
+    needs: [ logs-1760k ]
     # If the previous job fails, we still want to show the logs.
     if: ${{ !cancelled() }}
     runs-on: ubuntu-latest
@@ -717,6 +839,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -739,7 +862,8 @@ jobs:
           ${{ inputs.test_id }} | \
           tee --output-error=exit /dev/stderr | \
           grep --max-count=1 --extended-regexp --color=always \
-          '(verified final checkpoint)|(test result:.*finished in)' \
+          -e 'verified final checkpoint' \
+          -e 'test result:.*finished in' \
           "
 
   # follow the logs of the test we just launched, until it finishes
@@ -773,6 +897,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
@@ -797,7 +922,7 @@ jobs:
           "
 
 
-  # check the results of the test
+  # check the results of the test, and show all of the test logs
   test-result:
     # TODO: update the job name here, and in the branch protection rules
     name: Run ${{ inputs.test_id }} test
@@ -830,13 +955,14 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
 
       # Check that the container executed at least 1 Rust test harness test, and that all tests passed.
       # Then wait for the container to finish, and exit with the test's exit status.
-      # Also shows recent test logs.
+      # Also shows all the test logs.
       #
       # If the container has already finished, `docker wait` should return its status.
       # But sometimes this doesn't work, so we use `docker inspect` as a fallback.
@@ -854,7 +980,7 @@ jobs:
           --command=' \
           set -e;
           docker logs \
-          --tail ${{ env.EXTRA_LOG_LINES }} \
+          --tail all \
           ${{ inputs.test_id }} | \
           tee --output-error=exit /dev/stderr | \
           grep --max-count=1 --extended-regexp --color=always \
@@ -892,14 +1018,22 @@ jobs:
         with:
           short-length: 7
 
+      # Performs formatting on disk name components.
+      #
       # Disk images in GCP are required to be in lowercase, but the blockchain network
-      # uses sentence case, so we need to downcase ${{ inputs.network }}
+      # uses sentence case, so we need to downcase ${{ inputs.network }}.
       #
-      # Passes ${{ inputs.network }} to subsequent steps using $NETWORK env variable
-      - name: Downcase network name for disks
+      # Disk image names in GCP are limited to 63 characters, so we need to limit
+      # branch names to 13 characters.
+      #
+      # Passes ${{ inputs.network }} to subsequent steps using $NETWORK env variable.
+      # Passes ${{ env.GITHUB_REF_SLUG_URL }} to subsequent steps using $SHORT_GITHUB_REF env variable.
+      - name: Format network name and branch name for disks
         run: |
           NETWORK_CAPS=${{ inputs.network }}
           echo "NETWORK=${NETWORK_CAPS,,}" >> $GITHUB_ENV
+          LONG_GITHUB_REF=${{ env.GITHUB_REF_SLUG_URL }}
+          echo "SHORT_GITHUB_REF=${LONG_GITHUB_REF:0:13}" >> $GITHUB_ENV
 
       # Setup gcloud CLI
       - name: Authenticate to Google Cloud
@@ -944,17 +1078,41 @@ jobs:
           SYNC_HEIGHT=$(echo $DOCKER_LOGS | grep -oE '${{ inputs.height_grep_text }}\([0-9]+\)' | grep -oE '[0-9]+' | tail -1 || [[ $? == 1 ]])
           echo "SYNC_HEIGHT=$SYNC_HEIGHT" >> $GITHUB_ENV
 
-      # Create an image from disk that will be used for following/other tests
+      # Sets the $UPDATE_SUFFIX env var to "-u" if using cached state,
+      # and the empty string otherwise.
+      #
+      # Also sets a unique date and time suffix $TIME_SUFFIX.
+      - name: Set update and time suffixes
+        run: |
+          UPDATE_SUFFIX=""
+
+          if [[ "${{ inputs.needs_zebra_state }}" == "true" ]]; then
+              UPDATE_SUFFIX="-u"
+          fi
+
+          # We're going to delete old images after a month, so we don't need the year here
+          TIME_SUFFIX=$(date '+%m%d%H%M%S' --utc)
+
+          echo "UPDATE_SUFFIX=$UPDATE_SUFFIX" >> $GITHUB_ENV
+          echo "TIME_SUFFIX=$TIME_SUFFIX" >> $GITHUB_ENV
+
+      # Create an image from disk that will be used for following/other tests.
+      #
       # This image can contain:
       # - Zebra cached state
       # - Zebra + lightwalletd cached state
-      # Which cached state is being saved to the disk is defined by ${{ inputs.disk_prefix }}
+      # Which cached state is being saved to the disk is defined by ${{ inputs.disk_prefix }}.
+      #
+      # The image name must be unique, and be 63 characters or less.
+      # The timestamp makes images from the same commit unique,
+      # as long as they don't finish in the same second.
       #
       # Force the image creation (--force) as the disk is still attached even though is not being
-      # used by the container
+      # used by the container.
       - name: Create image from state disk
         run: |
-          gcloud compute images create ${{ inputs.disk_prefix }}-${{ env.GITHUB_REF_SLUG_URL }}-${{ env.GITHUB_SHA_SHORT }}-v${{ env.STATE_VERSION }}-${{ env.NETWORK }}-${{ inputs.disk_suffix }} \
+          gcloud compute images create \
+          "${{ inputs.disk_prefix }}-${SHORT_GITHUB_REF}-${{ env.GITHUB_SHA_SHORT }}-v${{ env.STATE_VERSION }}-${{ env.NETWORK }}-${{ inputs.disk_suffix }}${UPDATE_SUFFIX}-${TIME_SUFFIX}" \
           --force \
           --source-disk=${{ inputs.test_id }}-${{ env.GITHUB_SHA_SHORT }} \
           --source-disk-zone=${{ env.ZONE }} \
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index f989f57b488..ddff8841fd7 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -17,6 +17,12 @@ on:
       # workflow definitions
       - '.github/workflows/docs.yml'
 
+env:
+  RUST_LOG: info
+  RUST_BACKTRACE: full
+  RUST_LIB_BACKTRACE: full
+  COLORBT_SHOW_HIDDEN: '1'
+
 jobs:
   build:
     name: Build and Deploy Docs (+beta)
@@ -52,7 +58,7 @@ jobs:
           mdbook build book/
 
       - name: Deploy Zebra book to firebase
-        uses: w9jds/firebase-action@v2.2.2
+        uses: w9jds/firebase-action@v11.5.0
         with:
           args: deploy
         env:
@@ -68,7 +74,7 @@ jobs:
           RUSTDOCFLAGS: '--html-in-header katex-header.html'
 
       - name: Deploy external docs to firebase
-        uses: w9jds/firebase-action@v2.2.2
+        uses: w9jds/firebase-action@v11.5.0
         with:
           args: deploy
         env:
@@ -82,7 +88,7 @@ jobs:
           RUSTDOCFLAGS: '--html-in-header katex-header.html'
 
       - name: Deploy internal docs to firebase
-        uses: w9jds/firebase-action@v2.2.2
+        uses: w9jds/firebase-action@v11.5.0
         with:
           args: deploy
         env:
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index cac408bb78e..668c3229a22 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -10,6 +10,13 @@ on:
     branches:
       - 'main'
 
+env:
+  CARGO_INCREMENTAL: 0
+  RUST_LOG: info
+  RUST_BACKTRACE: full
+  RUST_LIB_BACKTRACE: full
+  COLORBT_SHOW_HIDDEN: '1'
+
 jobs:
   changed-files:
     runs-on: ubuntu-latest
@@ -25,7 +32,7 @@ jobs:
 
       - name: Rust files
         id: changed-files-rust
-        uses: tj-actions/changed-files@v24
+        uses: tj-actions/changed-files@v29.0.1
         with:
           files: |
             **/*.rs
@@ -37,7 +44,7 @@ jobs:
 
       - name: Workflow files
         id: changed-files-workflows
-        uses: tj-actions/changed-files@v24
+        uses: tj-actions/changed-files@v29.0.1
         with:
           files: |
             .github/workflows/*.yml
diff --git a/.github/workflows/zcash-lightwalletd.yml b/.github/workflows/zcash-lightwalletd.yml
index f04f032f986..959c76eb15e 100644
--- a/.github/workflows/zcash-lightwalletd.yml
+++ b/.github/workflows/zcash-lightwalletd.yml
@@ -101,6 +101,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
diff --git a/.github/workflows/zcashd-manual-deploy.yml b/.github/workflows/zcashd-manual-deploy.yml
index 0099b307509..515cee44ce1 100644
--- a/.github/workflows/zcashd-manual-deploy.yml
+++ b/.github/workflows/zcashd-manual-deploy.yml
@@ -42,6 +42,7 @@ jobs:
         id: auth
         uses: google-github-actions/auth@v0.8.0
         with:
+          retries: '3'
           workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
           service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
           token_format: 'access_token'
diff --git a/Cargo.lock b/Cargo.lock
index 049c0240f34..732fa30421f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -740,15 +740,16 @@ dependencies = [
 
 [[package]]
 name = "chrono"
-version = "0.4.19"
+version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
+checksum = "6127248204b9aba09a362f6c930ef6a78f2c1b2215f8a7b398c06e1083f17af0"
 dependencies = [
- "libc",
+ "js-sys",
  "num-integer",
  "num-traits",
  "serde",
  "time 0.1.44",
+ "wasm-bindgen",
  "winapi",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index e2958c15afe..de480f72190 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,8 @@ panic = "abort"
 
 # Speed up tests by optimizing performance-critical crates
 
+# Cryptographic crates
+
 [profile.dev.package.blake2b_simd]
 opt-level = 3
 
@@ -41,11 +43,25 @@ opt-level = 3
 [profile.dev.package.bls12_381]
 opt-level = 3
 
-[profile.dev.package.minreq]
-opt-level = 1
+# Cryptographic and parameter download crates
 
 [profile.dev.package.zcash_proofs]
-opt-level = 1
+opt-level = 3
+
+[profile.dev.package.minreq]
+opt-level = 3
+
+[profile.dev.package.rustls]
+opt-level = 3
+
+[profile.dev.package.ring]
+opt-level = 3
+
+[profile.dev.package.spin]
+opt-level = 3
+
+[profile.dev.package.untrusted]
+opt-level = 3
 
 
 [profile.release]
diff --git a/README.md b/README.md
index cfcf821c2dd..fe669b66f89 100644
--- a/README.md
+++ b/README.md
@@ -80,8 +80,9 @@ for your platform:
 
 1. Install [`cargo` and `rustc`](https://www.rust-lang.org/tools/install).
      - Zebra is tested with the latest `stable` Rust version.
-        Earlier versions are not supported or tested, but they might work.
-        (Rust 1.57 and earlier are not supported, due to missing features.)
+       Earlier versions are not supported or tested.
+       Any Zebra release can remove support for older Rust versions, without any notice.
+       (Rust 1.59 and earlier are definitely not supported, due to missing features.)
 2. Install Zebra's build dependencies:
      - **libclang:** the `libclang`, `libclang-dev`, `llvm`, or `llvm-dev` packages, depending on your package manager
      - **clang** or another C++ compiler: `g++`, `Xcode`, or `MSVC`
@@ -102,10 +103,10 @@ cargo install --features=<name> ...
 ### System Requirements
 
 The recommended requirements for compiling and running `zebrad` are:
-- 4+ CPU cores
-- 16+ GB RAM
-- 100 GB+ available disk space for building binaries and storing cached chain state
-- 100+ Mbps network connections
+- 4 CPU cores
+- 16 GB RAM
+- 300 GB available disk space for building binaries and storing cached chain state
+- 100 Mbps network connection, with 300 GB of uploads and downloads per month 
 
 We continuously test that our builds and tests pass on:
 
@@ -156,10 +157,11 @@ If this is a problem for you, please
 [open a ticket.](https://github.com/ZcashFoundation/zebra/issues/new/choose)
 
 `zebrad`'s typical mainnet network usage is:
-- Initial sync: 40 GB download (in the longer term, several hundred GB are likely to be downloaded).
-- Ongoing updates: 10 MB - 1 GB upload and download per day, depending on user-created transaction size, and peer requests
+- Initial sync: 100 GB download, we expect the initial download to grow to hundreds of gigabytes over time
+- Ongoing updates: 10 MB - 10 GB upload and download per day, depending on user-created transaction size and peer requests
 
-Zebra also performs an initial sync every time its internal database version changes.
+Zebra performs an initial sync every time its internal database version changes,
+so some version upgrades might require a full download of the whole chain.
 
 For more detailed information, refer to the [documentation](https://zebra.zfnd.org/user/run.html).
 
@@ -173,11 +175,10 @@ See our [roadmap](#future-work) for details.
 
 ### Disk Usage
 
-Zebra uses up to 40 GB of space for cached mainnet data,
-and 10 GB of space for cached testnet data.
+Zebra uses around 100 GB of space for cached mainnet data, and 10 GB of space for cached testnet data.
+We expect disk usage to grow over time, so we recommend reserving at least 300 GB for mainnet nodes.
 
-RocksDB cleans up outdated data periodically,
-and when the database is closed and re-opened.
+Zebra's database cleans up outdated data periodically, and when Zebra is shut down and restarted.
 
 #### Disk Troubleshooting
 
diff --git a/book/src/dev/continous-delivery.md b/book/src/dev/continous-delivery.md
new file mode 100644
index 00000000000..e3592a145b5
--- /dev/null
+++ b/book/src/dev/continous-delivery.md
@@ -0,0 +1,28 @@
+# Zebra Continuous Delivery
+
+Zebra has an extension of it's continuous integration since it automatically deploys all
+code changes to a testing and/or pre-production environment after each PR gets merged
+into the `main` branch, and on each Zebra `release`.
+
+## Triggers
+
+The Continuous delivery pipeline is triggered when:
+
+* A PR is merged to `main` (technically, a `push` event)
+* A new release is published in GitHub
+
+## Deployments
+
+On each trigger Zebra is deployed using the branch or version references as part of
+the deployment naming convention. Deployments are made using [Managed Instance Groups (MIGs)](https://cloud.google.com/compute/docs/instance-groups#managed_instance_groups)
+from Google Cloud Platform with, 2 nodes in the us-central1 region.
+
+**Note**: These *MIGs* are always replaced when PRs are merged to the `main` branch and
+when a release is published. If a new major version is released, a new *MIG* is also 
+created, keeping the previous major version running until it's no longer needed.
+
+A single instance can also be deployed, on an on-demand basis, if required, when a
+long-lived instance, with specific changes, is needed to be tested in the Mainnet with
+the same infrastructure used for CI & CD.
+
+Further validations of the actual process can be done on our continuous delivery [workflow file](https://github.com/ZcashFoundation/zebra/blob/main/.github/workflows/continous-delivery.yml).
diff --git a/book/src/dev/continuous-integration.md b/book/src/dev/continuous-integration.md
new file mode 100644
index 00000000000..16089ff9da4
--- /dev/null
+++ b/book/src/dev/continuous-integration.md
@@ -0,0 +1,26 @@
+# Zebra Continuous Integration
+
+Zebra has extensive continuous integration tests for node syncing and `lightwalletd` integration.
+
+On every PR change, Zebra runs [these Docker tests](https://github.com/ZcashFoundation/zebra/blob/main/.github/workflows/continous-integration-docker.yml):
+- Zebra update syncs from a cached state Google Cloud tip image
+- lightwalletd full syncs from a cached state Google Cloud tip image
+- lightwalletd update syncs from a cached state Google Cloud tip image
+- lightwalletd integration with Zebra JSON-RPC and Light Wallet gRPC calls
+
+When a PR is merged to the `main` branch, we also run a Zebra full sync test from genesis.
+
+Some Docker tests are stateful, they can depend on:
+- built Zebra and `lightwalletd` docker images
+- cached state images in Google cloud
+- jobs that launch Google Cloud instances for each test
+- multiple jobs that follow the logs from Google Cloud (to work around the 6 hour GitHub actions limit)
+- a final "Run" job that checks the exit status of the Rust acceptance test
+
+To support this test state, some Docker tests depend on other tests finishing first.
+
+Currently, each Zebra and lightwalletd sync updates the cached images, which are shared by all tests.
+Tests prefer the latest image generated from the same branch and commit. But if they are not available, they will use the latest image from any branch and commit, as long as the state version is the same.
+
+Zebra also does [a smaller set of tests](https://github.com/ZcashFoundation/zebra/blob/main/.github/workflows/continous-integration-os.yml) on tier 2 platforms using GitHub actions runners.
+
diff --git a/zebra-chain/Cargo.toml b/zebra-chain/Cargo.toml
index df7aa486ab6..32c2997074b 100644
--- a/zebra-chain/Cargo.toml
+++ b/zebra-chain/Cargo.toml
@@ -35,7 +35,7 @@ rand_core = "0.6.3"
 ripemd = "0.1.1"
 # Matches version used by hdwallet
 secp256k1 = { version = "0.21.3", features = ["serde"] }
-sha2 = { version = "0.9.9", features=["compress"] }
+sha2 = { version = "0.9.9", features = ["compress"] }
 subtle = "2.4.1"
 uint = "0.9.1"
 x25519-dalek = { version = "1.2.0", features = ["serde"] }
@@ -49,7 +49,7 @@ zcash_note_encryption = "0.1"
 zcash_primitives = { version = "0.7.0", features = ["transparent-inputs"] }
 
 # Time
-chrono = { version = "0.4.19", features = ["serde"] }
+chrono = { version = "0.4.20", default-features = false, features = ["clock", "std", "serde"] }
 humantime = "2.1.0"
 
 # Error Handling & Formatting
diff --git a/zebra-chain/src/chain_tip/network_chain_tip_height_estimator.rs b/zebra-chain/src/chain_tip/network_chain_tip_height_estimator.rs
index 3a310524da0..5d4e1f59237 100644
--- a/zebra-chain/src/chain_tip/network_chain_tip_height_estimator.rs
+++ b/zebra-chain/src/chain_tip/network_chain_tip_height_estimator.rs
@@ -93,7 +93,7 @@ impl NetworkChainTipHeightEstimator {
             let target_spacing_seconds = self.current_target_spacing.num_seconds();
             let time_to_activation = Duration::seconds(remaining_blocks * target_spacing_seconds);
 
-            self.current_block_time = self.current_block_time + time_to_activation;
+            self.current_block_time += time_to_activation;
             self.current_height = max_height;
         }
     }
diff --git a/zebra-chain/src/serialization/arbitrary.rs b/zebra-chain/src/serialization/arbitrary.rs
index 953e8643c16..9c432475891 100644
--- a/zebra-chain/src/serialization/arbitrary.rs
+++ b/zebra-chain/src/serialization/arbitrary.rs
@@ -2,7 +2,7 @@
 
 use std::convert::TryInto;
 
-use chrono::{TimeZone, Utc, MAX_DATETIME, MIN_DATETIME};
+use chrono::{DateTime, TimeZone, Utc};
 use proptest::{arbitrary::any, prelude::*};
 
 use super::{
@@ -41,7 +41,7 @@ impl Arbitrary for DateTime32 {
 pub fn datetime_full() -> impl Strategy<Value = chrono::DateTime<Utc>> {
     (
         // TODO: should we be subtracting 1 from the maximum timestamp?
-        MIN_DATETIME.timestamp()..=MAX_DATETIME.timestamp(),
+        DateTime::<Utc>::MIN_UTC.timestamp()..=DateTime::<Utc>::MAX_UTC.timestamp(),
         0..2_000_000_000_u32,
     )
         .prop_map(|(secs, nsecs)| Utc.timestamp(secs, nsecs))
diff --git a/zebra-consensus/Cargo.toml b/zebra-consensus/Cargo.toml
index a0624f98828..c8e55223f77 100644
--- a/zebra-consensus/Cargo.toml
+++ b/zebra-consensus/Cargo.toml
@@ -18,7 +18,7 @@ jubjub = "0.9.0"
 rand = { version = "0.8.5", package = "rand" }
 rayon = "1.5.3"
 
-chrono = "0.4.19"
+chrono = { version = "0.4.20", default-features = false, features = ["clock", "std"] }
 dirs = "4.0.0"
 displaydoc = "0.2.3"
 lazy_static = "1.4.0"
diff --git a/zebra-consensus/src/checkpoint/main-checkpoints.txt b/zebra-consensus/src/checkpoint/main-checkpoints.txt
index 616b67e4426..7da6a804a8d 100644
--- a/zebra-consensus/src/checkpoint/main-checkpoints.txt
+++ b/zebra-consensus/src/checkpoint/main-checkpoints.txt
@@ -4986,3 +4986,644 @@
 1751364 000000000031da480502e8a9c5683253255651a8e4afcae694f2da88550f6dab
 1751447 0000000000166276995b9996332528c5d5fccc7a3ac43a0673f860d79e0d1ee0
 1751518 000000000003ca14e1f3b663d4bcf7aab3d645c3c8aa8b8d561f616ba070a36d
+1751609 0000000000800d95f6f7c48b18b428b95be1b8fc0a6c079095f70abd0fcdacbb
+1751689 0000000001480f0eed4c1e7fbedf342376bde415248a4ff16d59c731b33d08ef
+1751742 0000000000cb236645779fbadecdb3df3b0669b7ca759596c8e417d1ec83ee54
+1751793 0000000000b6ca448dc2fa6c3bf3a60df69f36b6c0c54f92800f7d8e50531e95
+1751833 0000000001ab6f03b84ea59be7fa2262c2139ff5e5d0c4f34d6f25f8d0790e59
+1751883 0000000001767fc3a34e6e5ae3537d0a4e9fdfee90e181aff50ca3fcf3cbae4e
+1751920 000000000009231d7fe98bc7e82bd907a70315b32e21713d0ce6f51e7ffc92c0
+1751953 0000000000a93bc4fd5cc4277862a34b0dca63ba0f62fc118a02ca12886fa9dc
+1751985 00000000007caa4d6b7b20f6ba819f492c93d871360805d9fde09cec2212eaba
+1752038 0000000001a1c5b0de9631dae3b042332fde3dee9ecc6d17c7ffafdbffc26a67
+1752078 0000000001833abfa8c01c32784ac7bb219d6874969f3fb549ab4299a91bff3c
+1752121 0000000001c3a27f112f2fd11a95cecb608454d44287e44b9c6033895a617764
+1752159 0000000000b327a70b7d2fdb090112d8845486ff55faeeba7be92ad22a9eb61e
+1752196 0000000000e9f8f7b533785cc3219986f80904e94962542fcd7057056d3df709
+1752229 0000000001d3d2328555dfd046c12a3e6259cc56191efaf3176c548ce83f9c55
+1752277 0000000000cefd7d05f9ae37b2ce122eed8a40d5d6f66a352c0bf9d4636dd2f7
+1752309 0000000000608009fc98ab2d1d5fdd9fbc7f5105f0aa3329c08031e8b689783a
+1752349 000000000174f19b99eba020c5690e6fc3712b65efe08d06f3e7bba41450c1fd
+1752377 00000000010f4913ac1dd940692071c2d658064643f60e5b10c5131753582ec2
+1752413 0000000001825c783f7ad5367b6121d96295a539506d5d374d049ee4d02c83c8
+1752457 0000000001696da673e3d71e3037d610d1ec7de9fc6423077e332129cc754ddd
+1752498 0000000000485a623817ebc19922b093f3afbe67940aa39de6f8c8e8af99e4c8
+1752530 0000000000e1b526df7cff1aa0ba7f193b18f58ae393f45b98a49e40eae47bea
+1752566 000000000121ff4eb5f0274a3ea83678a0601a95ac2812f1bd1febb355ead78a
+1752604 000000000031185ee2ab26a64c0f3cdd787b4480a7d0337b02f629dbf303f365
+1752635 0000000000ba52e7d7c4c6eec18f75d2465c84816300d3ed708b3089cb2f46c3
+1752671 0000000001d333e18ae681a225e0661ab5b89b0f560c8379b56fabc252575624
+1752711 000000000150719e03d8c5345d7f98077fceae784604a4dc67a8f900cd15d699
+1752753 00000000006bb9d84f6b2fcc463ed03a51038eaa3e9e897e1c91691c53f139fb
+1752790 00000000004990f7ff328bb9212ede946319fdba913fcca3aa9fca0c40c44cab
+1752823 00000000018c7beb65698b97d95094c4d49dc8002864f4be5121dfd53ff552dd
+1752865 00000000011fc821ae2ecc7e8ccfc79d2fba75f844b02e7fe3a6aa20545a56f8
+1752904 0000000000ba5ccdf54a0e52f3000624ac363cb1dd24e546a324f63359f542bd
+1752938 00000000008882709322a733f923b8ebf9c8333476b72f4c2c9decb093af0169
+1752974 00000000010e25b203772884007aeb56932e36dd32368b5be5d6640d2426c6bb
+1753015 0000000000278f4cd6aa299e971e011a632868b263159951e8a159c3b93ad581
+1753046 000000000175918319fd67d12b88d401057ad00b0b4c83692c6e920fddc3a1bf
+1753081 000000000073b0eafb303f1037639ad8caa6dd3425befda6cc10143bdba34076
+1753109 00000000014b95c339096af89bb0d2c70075d87db32be00acd911b4fe67abf63
+1753149 0000000000c376d0687c0def83d6086d501d992080f4579b480c7fd8dfc58aec
+1753205 0000000000267937446d63d3454f85fa97ae490e642dfc39bbd312ca2ff9c565
+1753243 0000000001deb41a4ece40e0a0e6b7834012e141c8e5143a704f3923731867b2
+1753285 000000000149493f6824c11e4d5fdf7676f73b6cc201825a350701dd57c0a0d6
+1753319 0000000000d1f15b8071f4832cb39290b8ba9f81a0852b1b292addbc7815f107
+1753356 00000000000a296f32f51702286013f3709da1cba8b8e5ded02e3c6e36039ef5
+1753399 0000000000cc23f5cb41861f5ae80b0fdaac6bad56f123ea18ddbe6dd1f80e2c
+1753436 00000000013e7c55c28af1cd7de47f84ac5368002096157d4c5839bca7751a94
+1753467 000000000053a79df7292b692a9aa13f7ffcfb3bcd101725cdb676277dc9f7f0
+1753511 00000000017a0cb382f5952bd16796f6e5c756d300b3138d18ece14969304b44
+1753550 000000000028d8ab8f8f91224c0fd4068d77047415ddac7c813a593c43d72a5f
+1753586 0000000000a7372071eda318aa29df291be93e6945edbab63491214909099563
+1753628 00000000000824c5f25012afa9a002755823c2d0a3f21e186e9f64ad8f09f2d2
+1753667 00000000010175313c1866bcbd1805af0984420e3d9ebba031a981c006235067
+1753716 00000000001d542a6df159733f650a8d06345170b4b8da669d2bfd9a374be529
+1753800 00000000002f4816d1664027df72181092798f0b94dc285906b756b4bc221cb0
+1753862 000000000066be9ed4790bfc8b966a36ce4235adfe695c068585ea26b5ab44f2
+1753900 0000000000c8e7961ad49316fe5f2d81ebf1ed2701ae6f0ea8ef1b8bfd638d4f
+1753954 00000000013dd47aaa066d5a69d8d2478eb69854a9c3f79a546c9d25c81fc2bd
+1754000 000000000145a74bef86157a79e149e0f982453413a028abdb71a2a6f13c0606
+1754038 0000000000ed3eff0b93ef37ff1a122fcdbbe33fdcefa51271cc4c0081572549
+1754086 00000000009dcdb9f98ca7bc6b25459a266b2661228d1bf7b8b2c53a7def3762
+1754129 0000000000ab21636b321d250ee77e0b6468eeeca62f382fbd606adaeeef8421
+1754178 0000000000ef969ebaaff7e4ee2b45035da1ebda36bc0853b382ef182f1d7394
+1754228 000000000030888c9789ae48bf897819a075f6da41e9aecfa49c8bc371640280
+1754265 0000000001d57b8d6700d81cf8a777d07061227c8e46f629309f9f98a2335ef3
+1754314 000000000025679ef0051936ff1c8afcc92e32640eeb9274199f18ef510de32b
+1754357 000000000119866d111781b52327b00a2a94b71ee2fd7edfef18483dd1c2bcda
+1754390 00000000009f02e1e632eba93e043611deb33f40f6fbb1ea6d684b09288a768c
+1754449 000000000063d0aa2c67e7aaac3e9b31ef375926368a865404f13eb4b182f25d
+1754488 0000000001625cea0bac30615f385e26b3066015249e6bcc18d793abfcd312de
+1754533 0000000000cf8fc5be2ea0bb418692b2f4bf4b790227eba4150872eb7b682dae
+1754576 0000000001ba8f58db5fcfebe97e33b7cf306ea36eee59a2c9ffa66f261ec2f8
+1754620 0000000000e47db4be8cd5cc44025c8899bdd45755943d12cecee365e16de823
+1754667 0000000001818b19327e1defa47e6b214e3c580a1099caf94ace556e8db3980a
+1754705 0000000001da1e86792d4bbb93ee61aa6cf093d7c749373e978388eb9efd7234
+1754765 00000000005ecfde33846ddf294e3e9e54e2a68013c9ab4ff6a439f5e5c4bdf4
+1754802 0000000001ef86a5d3c12f5222279b28a523b9c0b16e8f483106c8ca7d551e8f
+1754851 000000000102002620b57b05fedb976ed92e4740e05ddc1a84424bd66a5c7a33
+1754899 0000000000fb0f3bcd8b98a801beca7f19d6cad2a21c2748dfcb3d11a768b322
+1754960 0000000000d8e6bf50f5b302f87c37a2d3f71f9e8e22147cb1e25f66182f34da
+1754997 000000000057fb740775757c712758a79fd869a83426a916a591cde79fb4069e
+1755046 0000000001ae8eb3008a820c8b6102b3f312dd3ee58fbf4feb9d1ad9a784028a
+1755101 000000000098b3cc545d0f337308c40d719dba743c3f3f384e2235ecf57d6d9b
+1755131 0000000001561492e426722098be3d6914e60c90f0a4eed2a958c3f84e8637ad
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diff --git a/zebra-consensus/src/transaction/tests.rs b/zebra-consensus/src/transaction/tests.rs
index bae2d326c78..21f579884cd 100644
--- a/zebra-consensus/src/transaction/tests.rs
+++ b/zebra-consensus/src/transaction/tests.rs
@@ -1,11 +1,9 @@
 //! Tests for Zcash transaction consensus checks.
 
-use std::{
-    collections::HashMap,
-    convert::{TryFrom, TryInto},
-    sync::Arc,
-};
+use std::{collections::HashMap, sync::Arc};
 
+use chrono::{DateTime, Utc};
+use color_eyre::eyre::Report;
 use halo2::pasta::{group::ff::PrimeField, pallas};
 use tower::{service_fn, ServiceExt};
 
@@ -27,10 +25,9 @@ use zebra_chain::{
     transparent::{self, CoinbaseData},
 };
 
-use super::{check, Request, Verifier};
-
 use crate::error::TransactionError;
-use color_eyre::eyre::Report;
+
+use super::{check, Request, Verifier};
 
 #[cfg(test)]
 mod prop;
@@ -264,7 +261,7 @@ async fn v5_transaction_is_rejected_before_nu5_activation() {
                 height: canopy
                     .activation_height(network)
                     .expect("Canopy activation height is specified"),
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -327,7 +324,7 @@ fn v5_transaction_is_accepted_after_nu5_activation_for_network(network: Network)
                 transaction: Arc::new(transaction),
                 known_utxos: Arc::new(HashMap::new()),
                 height: expiry_height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -377,7 +374,7 @@ async fn v4_transaction_with_transparent_transfer_is_accepted() {
             transaction: Arc::new(transaction),
             known_utxos: Arc::new(known_utxos),
             height: transaction_block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -416,7 +413,7 @@ async fn v4_transaction_with_last_valid_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(known_utxos),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -461,7 +458,7 @@ async fn v4_coinbase_transaction_with_low_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(HashMap::new()),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -503,7 +500,7 @@ async fn v4_transaction_with_too_low_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(known_utxos),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -548,7 +545,7 @@ async fn v4_transaction_with_exceeding_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(known_utxos),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -601,7 +598,7 @@ async fn v4_coinbase_transaction_with_exceeding_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(HashMap::new()),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -652,7 +649,7 @@ async fn v4_coinbase_transaction_is_accepted() {
             transaction: Arc::new(transaction),
             known_utxos: Arc::new(HashMap::new()),
             height: transaction_block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -702,7 +699,7 @@ async fn v4_transaction_with_transparent_transfer_is_rejected_by_the_script() {
             transaction: Arc::new(transaction),
             known_utxos: Arc::new(known_utxos),
             height: transaction_block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -752,7 +749,7 @@ async fn v4_transaction_with_conflicting_transparent_spend_is_rejected() {
             transaction: Arc::new(transaction),
             known_utxos: Arc::new(known_utxos),
             height: transaction_block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -818,7 +815,7 @@ fn v4_transaction_with_conflicting_sprout_nullifier_inside_joinsplit_is_rejected
                 transaction: Arc::new(transaction),
                 known_utxos: Arc::new(HashMap::new()),
                 height: transaction_block_height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -889,7 +886,7 @@ fn v4_transaction_with_conflicting_sprout_nullifier_across_joinsplits_is_rejecte
                 transaction: Arc::new(transaction),
                 known_utxos: Arc::new(HashMap::new()),
                 height: transaction_block_height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -943,7 +940,7 @@ async fn v5_transaction_with_transparent_transfer_is_accepted() {
             transaction: Arc::new(transaction),
             known_utxos: Arc::new(known_utxos),
             height: transaction_block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -983,7 +980,7 @@ async fn v5_transaction_with_last_valid_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(known_utxos),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1026,7 +1023,7 @@ async fn v5_coinbase_transaction_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(HashMap::new()),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1047,7 +1044,7 @@ async fn v5_coinbase_transaction_expiry_height() {
             transaction: Arc::new(new_transaction.clone()),
             known_utxos: Arc::new(HashMap::new()),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1072,7 +1069,7 @@ async fn v5_coinbase_transaction_expiry_height() {
             transaction: Arc::new(new_transaction.clone()),
             known_utxos: Arc::new(HashMap::new()),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1099,7 +1096,7 @@ async fn v5_coinbase_transaction_expiry_height() {
             transaction: Arc::new(new_transaction.clone()),
             known_utxos: Arc::new(HashMap::new()),
             height: new_expiry_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1141,7 +1138,7 @@ async fn v5_transaction_with_too_low_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(known_utxos),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1187,7 +1184,7 @@ async fn v5_transaction_with_exceeding_expiry_height() {
             transaction: Arc::new(transaction.clone()),
             known_utxos: Arc::new(known_utxos),
             height: block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1241,7 +1238,7 @@ async fn v5_coinbase_transaction_is_accepted() {
             transaction: Arc::new(transaction),
             known_utxos: Arc::new(known_utxos),
             height: transaction_block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1293,7 +1290,7 @@ async fn v5_transaction_with_transparent_transfer_is_rejected_by_the_script() {
             transaction: Arc::new(transaction),
             known_utxos: Arc::new(known_utxos),
             height: transaction_block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1345,7 +1342,7 @@ async fn v5_transaction_with_conflicting_transparent_spend_is_rejected() {
             transaction: Arc::new(transaction),
             known_utxos: Arc::new(known_utxos),
             height: transaction_block_height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1390,7 +1387,7 @@ fn v4_with_signed_sprout_transfer_is_accepted() {
                 transaction,
                 known_utxos: Arc::new(HashMap::new()),
                 height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -1463,7 +1460,7 @@ async fn v4_with_joinsplit_is_rejected_for_modification(
             transaction,
             known_utxos: Arc::new(HashMap::new()),
             height,
-            time: chrono::MAX_DATETIME,
+            time: DateTime::<Utc>::MAX_UTC,
         })
         .await;
 
@@ -1499,7 +1496,7 @@ fn v4_with_sapling_spends() {
                 transaction,
                 known_utxos: Arc::new(HashMap::new()),
                 height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -1542,7 +1539,7 @@ fn v4_with_duplicate_sapling_spends() {
                 transaction,
                 known_utxos: Arc::new(HashMap::new()),
                 height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -1587,7 +1584,7 @@ fn v4_with_sapling_outputs_and_no_spends() {
                 transaction,
                 known_utxos: Arc::new(HashMap::new()),
                 height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -1636,7 +1633,7 @@ fn v5_with_sapling_spends() {
                 transaction: Arc::new(transaction),
                 known_utxos: Arc::new(HashMap::new()),
                 height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -1680,7 +1677,7 @@ fn v5_with_duplicate_sapling_spends() {
                 transaction: Arc::new(transaction),
                 known_utxos: Arc::new(HashMap::new()),
                 height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
@@ -1743,7 +1740,7 @@ fn v5_with_duplicate_orchard_action() {
                 transaction: Arc::new(transaction),
                 known_utxos: Arc::new(HashMap::new()),
                 height,
-                time: chrono::MAX_DATETIME,
+                time: DateTime::<Utc>::MAX_UTC,
             })
             .await;
 
diff --git a/zebra-consensus/src/transaction/tests/prop.rs b/zebra-consensus/src/transaction/tests/prop.rs
index e243dd4fa98..aaddb3649d6 100644
--- a/zebra-consensus/src/transaction/tests/prop.rs
+++ b/zebra-consensus/src/transaction/tests/prop.rs
@@ -1,6 +1,6 @@
 //! Randomised property tests for transaction verification.
 
-use std::{collections::HashMap, convert::TryInto, sync::Arc};
+use std::{collections::HashMap, sync::Arc};
 
 use chrono::{DateTime, Duration, Utc};
 use proptest::{collection::vec, prelude::*};
@@ -14,9 +14,10 @@ use zebra_chain::{
     transparent,
 };
 
-use super::mock_transparent_transfer;
 use crate::{error::TransactionError, transaction};
 
+use super::mock_transparent_transfer;
+
 /// The maximum number of transparent inputs to include in a mock transaction.
 const MAX_TRANSPARENT_INPUTS: usize = 10;
 
@@ -204,7 +205,7 @@ proptest! {
             (first_datetime, second_datetime)
         } else if first_datetime > second_datetime {
             (second_datetime, first_datetime)
-        } else if first_datetime == chrono::MAX_DATETIME {
+        } else if first_datetime == DateTime::<Utc>::MAX_UTC {
             (first_datetime - Duration::nanoseconds(1), first_datetime)
         } else {
             (first_datetime, first_datetime + Duration::nanoseconds(1))
diff --git a/zebra-network/Cargo.toml b/zebra-network/Cargo.toml
index e40e8015ea3..f9c7930e8ff 100644
--- a/zebra-network/Cargo.toml
+++ b/zebra-network/Cargo.toml
@@ -16,7 +16,7 @@ proptest-impl = ["proptest", "proptest-derive", "zebra-chain/proptest-impl"]
 bitflags = "1.3.2"
 byteorder = "1.4.3"
 bytes = "1.2.1"
-chrono = "0.4.19"
+chrono = { version = "0.4.20", default-features = false, features = ["clock", "std"] }
 hex = "0.4.3"
 humantime-serde = "1.1.1"
 indexmap = { version = "1.9.1", features = ["serde"] }
diff --git a/zebra-network/src/protocol/external/codec.rs b/zebra-network/src/protocol/external/codec.rs
index f007b73c648..1c6de9b8f05 100644
--- a/zebra-network/src/protocol/external/codec.rs
+++ b/zebra-network/src/protocol/external/codec.rs
@@ -2,7 +2,6 @@
 
 use std::{
     cmp::min,
-    convert::TryInto,
     fmt,
     io::{Cursor, Read, Write},
 };
@@ -724,15 +723,18 @@ impl Codec {
     }
 }
 
-// XXX replace these interior unit tests with exterior integration tests + proptest
+// TODO:
+// - move these unit tests to a separate file
+// - add exterior integration tests + proptest
 #[cfg(test)]
 mod tests {
-    use super::*;
+    use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 
-    use chrono::{MAX_DATETIME, MIN_DATETIME};
+    use chrono::DateTime;
     use futures::prelude::*;
     use lazy_static::lazy_static;
-    use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+
+    use super::*;
 
     lazy_static! {
         static ref VERSION_TEST_VECTOR: Message = {
@@ -808,8 +810,10 @@ mod tests {
 
         deserialize_version_with_time(1620777600).expect("recent time is valid");
         deserialize_version_with_time(0).expect("zero time is valid");
-        deserialize_version_with_time(MIN_DATETIME.timestamp()).expect("min time is valid");
-        deserialize_version_with_time(MAX_DATETIME.timestamp()).expect("max time is valid");
+        deserialize_version_with_time(DateTime::<Utc>::MIN_UTC.timestamp())
+            .expect("min time is valid");
+        deserialize_version_with_time(DateTime::<Utc>::MAX_UTC.timestamp())
+            .expect("max time is valid");
     }
 
     /// Deserialize a `Version` message containing `time`, and return the result.
diff --git a/zebra-rpc/Cargo.toml b/zebra-rpc/Cargo.toml
index d14f2c613eb..6bd3b1ff83a 100644
--- a/zebra-rpc/Cargo.toml
+++ b/zebra-rpc/Cargo.toml
@@ -12,12 +12,7 @@ default = []
 proptest-impl = ["proptest", "proptest-derive", "zebra-chain/proptest-impl", "zebra-state/proptest-impl"]
 
 [dependencies]
-zebra-chain = { path = "../zebra-chain" }
-zebra-network = { path = "../zebra-network" }
-zebra-node-services = { path = "../zebra-node-services" }
-zebra-state = { path = "../zebra-state" }
-
-chrono = "0.4.19"
+chrono = { version = "0.4.20", default-features = false, features = ["clock", "std"] }
 futures = "0.3.21"
 
 # lightwalletd sends JSON-RPC requests over HTTP 1.1
@@ -42,6 +37,11 @@ serde = { version = "1.0.142", features = ["serde_derive"] }
 proptest = { version = "0.10.1", optional = true }
 proptest-derive = { version = "0.3.0", optional = true }
 
+zebra-chain = { path = "../zebra-chain" }
+zebra-network = { path = "../zebra-network" }
+zebra-node-services = { path = "../zebra-node-services" }
+zebra-state = { path = "../zebra-state" }
+
 [dev-dependencies]
 insta = { version = "1.17.1", features = ["redactions"] }
 proptest = "0.10.1"
diff --git a/zebra-state/Cargo.toml b/zebra-state/Cargo.toml
index 69345ddc391..82df95dfcc0 100644
--- a/zebra-state/Cargo.toml
+++ b/zebra-state/Cargo.toml
@@ -10,7 +10,7 @@ proptest-impl = ["proptest", "proptest-derive", "zebra-test", "zebra-chain/propt
 
 [dependencies]
 bincode = "1.3.3"
-chrono = "0.4.19"
+chrono = { version = "0.4.20", default-features = false, features = ["clock", "std"] }
 dirs = "4.0.0"
 displaydoc = "0.2.3"
 futures = "0.3.21"
diff --git a/zebrad/Cargo.toml b/zebrad/Cargo.toml
index 6c979d45c26..ba068e3895f 100644
--- a/zebrad/Cargo.toml
+++ b/zebrad/Cargo.toml
@@ -77,7 +77,7 @@ zebra-state = { path = "../zebra-state" }
 
 abscissa_core = "0.5"
 gumdrop = "0.7"
-chrono = "0.4.19"
+chrono = { version = "0.4.20", default-features = false, features = ["clock", "std"] }
 humantime = "2.1.0"
 humantime-serde = "1.1.1"
 indexmap = "1.9.1"
diff --git a/zebrad/build.rs b/zebrad/build.rs
index 20138ba89c1..62560642b1e 100644
--- a/zebrad/build.rs
+++ b/zebrad/build.rs
@@ -60,6 +60,10 @@ fn main() {
     tonic_build::configure()
         .build_client(true)
         .build_server(false)
+        // The lightwalletd gRPC types don't use floats or complex collections,
+        // so we can derive `Eq` as well as the default generated `PartialEq` derive.
+        // This fixes `clippy::derive_partial_eq_without_eq` warnings.
+        .type_attribute(".", "#[derive(Eq)]")
         .compile(
             &["tests/common/lightwalletd/proto/service.proto"],
             &["tests/common/lightwalletd/proto"],
diff --git a/zebrad/tests/acceptance.rs b/zebrad/tests/acceptance.rs
index 94b042f78cd..58bc9f3b1a0 100644
--- a/zebrad/tests/acceptance.rs
+++ b/zebrad/tests/acceptance.rs
@@ -354,6 +354,7 @@ fn misconfigured_ephemeral_missing_directory() -> Result<()> {
     )
 }
 
+#[tracing::instrument]
 fn ephemeral(cache_dir_config: EphemeralConfig, cache_dir_check: EphemeralCheck) -> Result<()> {
     use std::io::ErrorKind;
 
@@ -520,6 +521,7 @@ fn config_test() -> Result<()> {
 }
 
 /// Test that `zebrad start` can parse the output from `zebrad generate`.
+#[tracing::instrument]
 fn valid_generated_config(command: &str, expect_stdout_line_contains: &str) -> Result<()> {
     let _init_guard = zebra_test::init();
 
@@ -823,6 +825,7 @@ fn sync_large_checkpoints_mempool_mainnet() -> Result<()> {
     .map(|_tempdir| ())
 }
 
+#[tracing::instrument]
 fn create_cached_database(network: Network) -> Result<()> {
     let height = network.mandatory_checkpoint_height();
     let checkpoint_stop_regex = format!("{}.*CommitFinalized request", STOP_AT_HEIGHT_REGEX);
@@ -839,6 +842,7 @@ fn create_cached_database(network: Network) -> Result<()> {
     )
 }
 
+#[tracing::instrument]
 fn sync_past_mandatory_checkpoint(network: Network) -> Result<()> {
     let height = network.mandatory_checkpoint_height() + 1200;
     let full_validation_stop_regex =
@@ -862,6 +866,7 @@ fn sync_past_mandatory_checkpoint(network: Network) -> Result<()> {
 /// `timeout_argument_name` parameter. The value of the environment variable must the number of
 /// minutes specified as an integer.
 #[allow(clippy::print_stderr)]
+#[tracing::instrument]
 fn full_sync_test(network: Network, timeout_argument_name: &str) -> Result<()> {
     let timeout_argument: Option<u64> = env::var(timeout_argument_name)
         .ok()
@@ -1284,6 +1289,7 @@ async fn lightwalletd_test_suite() -> Result<()> {
 /// Set `FullSyncFromGenesis { allow_lightwalletd_cached_state: true }` to speed up manual full sync tests.
 ///
 /// The random ports in this test can cause [rare port conflicts.](#Note on port conflict)
+#[tracing::instrument]
 fn lightwalletd_integration_test(test_type: LightwalletdTestType) -> Result<()> {
     let _init_guard = zebra_test::init();
 
@@ -1686,6 +1692,7 @@ fn zebra_state_conflict() -> Result<()> {
 /// `second_dir`. Check that the first node's stdout contains
 /// `first_stdout_regex`, and the second node's stderr contains
 /// `second_stderr_regex`.
+#[tracing::instrument]
 fn check_config_conflict<T, U>(
     first_dir: T,
     first_stdout_regex: &str,
@@ -1693,8 +1700,8 @@ fn check_config_conflict<T, U>(
     second_stderr_regex: &str,
 ) -> Result<()>
 where
-    T: ZebradTestDirExt,
-    U: ZebradTestDirExt,
+    T: ZebradTestDirExt + std::fmt::Debug,
+    U: ZebradTestDirExt + std::fmt::Debug,
 {
     // Start the first node
     let mut node1 = first_dir.spawn_child(args!["start"])?;
diff --git a/zebrad/tests/common/cached_state.rs b/zebrad/tests/common/cached_state.rs
index 8739491d108..3323c3ac716 100644
--- a/zebrad/tests/common/cached_state.rs
+++ b/zebrad/tests/common/cached_state.rs
@@ -25,6 +25,7 @@ pub type BoxStateService =
     BoxService<zebra_state::Request, zebra_state::Response, zebra_state::BoxError>;
 
 /// Starts a state service using the provided `cache_dir` as the directory with the chain state.
+#[tracing::instrument(skip(cache_dir))]
 pub async fn start_state_service_with_cache_dir(
     network: Network,
     cache_dir: impl Into<PathBuf>,
@@ -47,6 +48,7 @@ pub async fn start_state_service_with_cache_dir(
 }
 
 /// Loads the chain tip height from the state stored in a specified directory.
+#[tracing::instrument]
 pub async fn load_tip_height_from_state_directory(
     network: Network,
     state_path: &Path,
@@ -87,6 +89,7 @@ pub async fn copy_state_directory(source: impl AsRef<Path>) -> Result<TempDir> {
 ///
 /// Copies all files from the `directory` into the destination specified by the concatenation of
 /// the `base_destination_path` and `directory` stripped of its `prefix`.
+#[tracing::instrument]
 async fn copy_directory(
     directory: &Path,
     prefix: &Path,
diff --git a/zebrad/tests/common/launch.rs b/zebrad/tests/common/launch.rs
index 075e5d23664..490bcd8bece 100644
--- a/zebrad/tests/common/launch.rs
+++ b/zebrad/tests/common/launch.rs
@@ -48,12 +48,12 @@ pub const BETWEEN_NODES_DELAY: Duration = Duration::from_secs(2);
 /// and `zebrad` takes about 30 minutes to update to the tip.
 ///
 /// TODO: reduce to 20 minutes when `zebrad` sync performance improves
-pub const LIGHTWALLETD_UPDATE_TIP_DELAY: Duration = Duration::from_secs(60 * 60);
+pub const LIGHTWALLETD_UPDATE_TIP_DELAY: Duration = Duration::from_secs(11 * 60 * 60);
 
 /// The amount of time we wait for lightwalletd to do a full sync to the tip.
 ///
 /// See [`LIGHTWALLETD_UPDATE_TIP_DELAY`] for details.
-pub const LIGHTWALLETD_FULL_SYNC_TIP_DELAY: Duration = Duration::from_secs(150 * 60);
+pub const LIGHTWALLETD_FULL_SYNC_TIP_DELAY: Duration = Duration::from_secs(11 * 60 * 60);
 
 /// The amount of extra time we wait for Zebra to sync to the tip,
 /// after we ignore a lightwalletd failure.
@@ -206,7 +206,8 @@ where
 ///
 /// This prevents it from downloading blocks. Instead, the `zebra_directory` parameter allows
 /// providing an initial state to the zebrad instance.
-pub fn spawn_zebrad_for_rpc_without_initial_peers<P: ZebradTestDirExt>(
+#[tracing::instrument]
+pub fn spawn_zebrad_for_rpc_without_initial_peers<P: ZebradTestDirExt + std::fmt::Debug>(
     network: Network,
     zebra_directory: P,
     test_type: LightwalletdTestType,
diff --git a/zebrad/tests/common/lightwalletd/send_transaction_test.rs b/zebrad/tests/common/lightwalletd/send_transaction_test.rs
index 56639f67141..db638204c67 100644
--- a/zebrad/tests/common/lightwalletd/send_transaction_test.rs
+++ b/zebrad/tests/common/lightwalletd/send_transaction_test.rs
@@ -145,6 +145,7 @@ pub async fn run() -> Result<()> {
 ///
 /// Returns a list of valid transactions that are not in any of the blocks present in the
 /// original `zebrad_state_path`.
+#[tracing::instrument]
 async fn load_transactions_from_a_future_block(
     network: Network,
     zebrad_state_path: PathBuf,
@@ -179,6 +180,7 @@ async fn load_transactions_from_a_future_block(
 ///
 /// If the specified `zebrad_state_path` contains a chain state that's not synchronized to a tip that's
 /// after `height`.
+#[tracing::instrument]
 async fn load_transactions_from_block_after(
     height: block::Height,
     network: Network,
@@ -213,6 +215,7 @@ async fn load_transactions_from_block_after(
 
 /// Performs a request to the provided read-only `state` service to fetch all transactions from a
 /// block at the specified `height`.
+#[tracing::instrument(skip(state))]
 async fn load_transactions_from_block<ReadStateService>(
     height: block::Height,
     state: &mut ReadStateService,
diff --git a/zebrad/tests/common/lightwalletd/wallet_grpc.rs b/zebrad/tests/common/lightwalletd/wallet_grpc.rs
index 78d575f6c9d..edfed7c5b3e 100644
--- a/zebrad/tests/common/lightwalletd/wallet_grpc.rs
+++ b/zebrad/tests/common/lightwalletd/wallet_grpc.rs
@@ -25,6 +25,7 @@ pub type LightwalletdRpcClient =
 /// Waits for `lightwalletd` to sync to near the tip, if `wait_for_sync` is true.
 ///
 /// Returns the lightwalletd instance and the port number that it is listening for RPC connections.
+#[tracing::instrument]
 pub fn spawn_lightwalletd_with_rpc_server(
     zebrad_rpc_address: SocketAddr,
     lightwalletd_state_path: Option<PathBuf>,
@@ -56,6 +57,7 @@ pub fn spawn_lightwalletd_with_rpc_server(
 }
 
 /// Connect to a lightwalletd RPC instance.
+#[tracing::instrument]
 pub async fn connect_to_lightwalletd(lightwalletd_rpc_port: u16) -> Result<LightwalletdRpcClient> {
     let lightwalletd_rpc_address = format!("http://127.0.0.1:{lightwalletd_rpc_port}");
 
diff --git a/zebrad/tests/common/sync.rs b/zebrad/tests/common/sync.rs
index ffb34f9e18e..495ca341497 100644
--- a/zebrad/tests/common/sync.rs
+++ b/zebrad/tests/common/sync.rs
@@ -86,6 +86,7 @@ pub const MIN_HEIGHT_FOR_DEFAULT_LOOKAHEAD: Height =
     Height(3 * sync::DEFAULT_CHECKPOINT_CONCURRENCY_LIMIT as u32);
 
 /// What the expected behavior of the mempool is for a test that uses [`sync_until`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum MempoolBehavior {
     /// The mempool should be forced to activate at a certain height, for debug purposes.
     ///
@@ -177,6 +178,7 @@ impl MempoolBehavior {
 /// On success, returns the associated `TempDir`. Returns an error if
 /// the child exits or `timeout` elapses before `stop_regex` is found.
 #[allow(clippy::too_many_arguments)]
+#[tracing::instrument(skip(reuse_tempdir))]
 pub fn sync_until(
     height: Height,
     network: Network,
@@ -297,6 +299,7 @@ pub fn sync_until(
 /// The zebrad instance is executed on a copy of the partially synchronized chain state. This copy
 /// is returned afterwards, containing the fully synchronized chain state.
 #[allow(dead_code)]
+#[tracing::instrument]
 pub async fn perform_full_sync_starting_from(
     network: Network,
     partial_sync_path: &Path,
@@ -354,6 +357,7 @@ pub fn cached_mandatory_checkpoint_test_config() -> Result<ZebradConfig> {
 /// Returns an error if the child exits or the fixed timeout elapses
 /// before `STOP_AT_HEIGHT_REGEX` is found.
 #[allow(clippy::print_stderr)]
+#[tracing::instrument]
 pub fn create_cached_database_height(
     network: Network,
     height: Height,
@@ -363,8 +367,8 @@ pub fn create_cached_database_height(
 ) -> Result<()> {
     eprintln!("creating cached database");
 
-    // 16 hours
-    let timeout = Duration::from_secs(60 * 60 * 16);
+    // 24 hours
+    let timeout = Duration::from_secs(24 * 60 * 60);
 
     // Use a persistent state, so we can handle large syncs
     let mut config = cached_mandatory_checkpoint_test_config()?;