fix: null not distinct

[mattkrick]

Description

no dupe global providers here!

Summary by CodeRabbit

• New Features
  • Introduced a migration that updates the uniqueness constraints in the IntegrationProvider table, allowing NULL values to be treated as non-distinct, enhancing flexibility in data handling.
• Bug Fixes
  • Improved the rollback functionality to revert changes made by the migration, ensuring database integrity.

[coderabbitai]

Walkthrough

This migration introduces changes to the IntegrationProvider table in a PostgreSQL database, specifically modifying how uniqueness is enforced with respect to NULL values. The new implementation allows NULL values in the columns orgId, teamId, service, and authStrategy to be treated as non-distinct, thereby enhancing flexibility. The migration includes functions to apply these changes and to revert them when necessary.

Changes

Files	Change Summary
packages/server/postgres/migrations/1722632147643_IntegrationProvider-null-not-distinct.ts	Introduces functions up and down for modifying unique constraint behaviour, allowing NULLs to be non-distinct.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant Database

    Client->>Database: Run migration
    Database-->>Client: Establish connection
    Client->>Database: Execute 'up' function
    Database-->>Client: Drop unique constraint
    Database-->>Client: Add new unique constraint (NULLs non-distinct)
    Client->>Database: Execute 'down' function
    Database-->>Client: Drop new unique constraint
    Database-->>Client: Restore original unique constraint

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