Hi @brian-hussey,

Since we use make black for code formatting, it will automatically reformat the code. Any manual changes made solely for readability will be reverted when we run make black to maintain consistent formatting across the codebase.

@kevalmahajan Tested the fix in local, and seems to be working fine.

Hi @brian-hussey,

Since we use make black for code formatting, it will automatically reformat the code. Any manual changes made solely for readability will be reverted when we run make black to maintain consistent formatting across the codebase.

Ah cool, thanks. I'll resolve the conversation so.

Changes Made During Review

1. Rebased onto main

• Branch rebased onto current main (8257613)
• Squashed 5 commits into 1 clean commit

2. Fixed Migration Idempotency (Critical)

The original migration was not idempotent and would fail when:

• Running against a DB created via Base.metadata.create_all() (tests use this)
• Re-running migrations in CI
• Partially applied migrations

Changes made:

• Added constraint_exists() helper to check unique constraints before drop/create
• Added index_exists() helper to check indexes before drop/create
• Added table existence checks (inspector.get_table_names())
• Made both upgrade() and downgrade() fully idempotent
• Follows existing patterns from f3a3a3d901b8_remove_gateway_url_unique_constraint.py

3. Code Review Summary

Design is sound:

• Adding gateway_id to composite constraints allows same uri/name across different gateways
• Partial unique index for gateway_id IS NULL enforces uniqueness for local items
• Consistent with how prompts already handle this (event listeners compute namespaced names)

No security issues identified.

No performance concerns - constraint changes are schema-level.

Ready for Testing

Please run:

make test

Additional Fixes (v2)

Addressed remaining issues:

1. Fixed exception handling in constraint_exists/index_exists

• Changed from return True to return False on exception
• Now if introspection fails, creates are attempted instead of skipped
• All create/drop operations wrapped in try/except to handle "already exists" gracefully

2. Fixed early return bug

• Refactored to use _upgrade_resources() and _upgrade_prompts() helper functions
• Each table is now processed independently
• Missing resources table no longer skips prompts migration

Summary of Changes

Ready for testing: make test

Final Review Complete ✅

Changes Made

1. Rebased & Squashed - 5 commits → 1 clean commit on latest main
2. Made migration idempotent - Added proper existence checks for all constraints/indexes
3. Fixed exception handling - Returns False on introspection failure so creates are attempted
4. Fixed early return bug - Each table processed independently
5. Added docstrings - Fixed flake8 DAR101 errors

Code Quality

• ✅ make flake8 passes
• ✅ make black isort applied
• ✅ make ruff passes
• ✅ Related tests pass (resource_service, prompt_service)

Follow-up

Regression tests for the new constraint behavior tracked in #2520

Ready to Merge

The PR is ready for final approval and merge.

Additional Follow-up Issue

Created #2522 to track the silent exception handling concern in the migration. The current implementation swallows all exceptions which could mask real schema failures.

Recommendation: Address #2522 before deploying to production environments where migration failures need to be surfaced.

✅ Manual Database Constraint Testing

Tested the implementation against a running PostgreSQL instance via docker-compose.

Verified Constraints

Resources table:

SELECT conname, pg_get_constraintdef(oid) FROM pg_constraint WHERE conrelid = 'resources'::regclass AND contype = 'u';

              conname               |              pg_get_constraintdef              
------------------------------------+------------------------------------------------
 uq_team_owner_gateway_uri_resource | UNIQUE (team_id, owner_email, gateway_id, uri)

SELECT indexname, indexdef FROM pg_indexes WHERE tablename = 'resources' AND indexname LIKE '%local%';

            indexname             |  indexdef                                                                   
----------------------------------+-----------------------------------------------------------------------------
 uq_team_owner_uri_resource_local | CREATE UNIQUE INDEX ... WHERE (gateway_id IS NULL)

Prompts table: Same pattern verified ✅

Test Results

How to Reproduce

# Start the stack
docker compose up -d

# Connect to PostgreSQL
docker exec mcp-context-forge-postgres-1 psql -U postgres -d mcp

# Run test queries (see above)

Conclusion

The gateway namespacing constraints are working correctly:

• ✅ Same resource/prompt URI can exist across different gateways
• ✅ Duplicate within same gateway is rejected
• ✅ Local items (gateway_id=NULL) still enforce uniqueness via partial index