diff --git a/backend/packages/Upgrade/src/api/models/IndividualEnrollment.ts b/backend/packages/Upgrade/src/api/models/IndividualEnrollment.ts
index 038d89d122..7c376a6b90 100644
--- a/backend/packages/Upgrade/src/api/models/IndividualEnrollment.ts
+++ b/backend/packages/Upgrade/src/api/models/IndividualEnrollment.ts
@@ -31,6 +31,7 @@ export class IndividualEnrollment extends BaseModel {
   @Column({ type: 'enum', enum: ENROLLMENT_CODE, nullable: true })
   public enrollmentCode: ENROLLMENT_CODE;
 
+  @Index()
   @ManyToOne(() => ExperimentCondition, { onDelete: 'CASCADE' })
   public condition: ExperimentCondition;
 }
diff --git a/backend/packages/Upgrade/src/api/models/IndividualExclusion.ts b/backend/packages/Upgrade/src/api/models/IndividualExclusion.ts
index 4611bb46ed..fa39ad97c6 100644
--- a/backend/packages/Upgrade/src/api/models/IndividualExclusion.ts
+++ b/backend/packages/Upgrade/src/api/models/IndividualExclusion.ts
@@ -1,6 +1,6 @@
 import { EXCLUSION_CODE } from 'upgrade_types';
 import { IsNotEmpty } from 'class-validator';
-import { Entity, PrimaryColumn, ManyToOne, Column } from 'typeorm';
+import { Entity, PrimaryColumn, ManyToOne, Column, Index } from 'typeorm';
 import { BaseModel } from './base/BaseModel';
 import { Experiment } from './Experiment';
 import { ExperimentUser } from './ExperimentUser';
@@ -10,6 +10,7 @@ export class IndividualExclusion extends BaseModel {
   @PrimaryColumn()
   public id: string;
 
+  @Index()
   @ManyToOne(() => Experiment, { onDelete: 'CASCADE' })
   public experiment: Experiment;
 
@@ -20,6 +21,7 @@ export class IndividualExclusion extends BaseModel {
   @Column({ type: 'enum', enum: EXCLUSION_CODE, nullable: true })
   public exclusionCode: EXCLUSION_CODE;
 
+  @Index()
   @ManyToOne(() => ExperimentUser, { onDelete: 'CASCADE' })
   public user: ExperimentUser;
 }
diff --git a/backend/packages/Upgrade/src/database/migrations/1716191003726-addingIndex.ts b/backend/packages/Upgrade/src/database/migrations/1716191003726-addingIndex.ts
new file mode 100644
index 0000000000..ea44ef43b9
--- /dev/null
+++ b/backend/packages/Upgrade/src/database/migrations/1716191003726-addingIndex.ts
@@ -0,0 +1,21 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class addingIndex1716191003726 implements MigrationInterface {
+  name = 'addingIndex1716191003726';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `CREATE INDEX "IDX_4f4d2f2ec491226d4692ed400f" ON "individual_enrollment" ("conditionId") `
+    );
+    await queryRunner.query(
+      `CREATE INDEX "IDX_43238be19de9500c290393b907" ON "individual_exclusion" ("experimentId") `
+    );
+    await queryRunner.query(`CREATE INDEX "IDX_de26ba8251f4ebf8b9c8ccf623" ON "individual_exclusion" ("userId") `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`DROP INDEX "public"."IDX_de26ba8251f4ebf8b9c8ccf623"`);
+    await queryRunner.query(`DROP INDEX "public"."IDX_43238be19de9500c290393b907"`);
+    await queryRunner.query(`DROP INDEX "public"."IDX_4f4d2f2ec491226d4692ed400f"`);
+  }
+}