feat: comprehensive database migration guidelines #10519
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Pull Request Overview
This PR introduces comprehensive database migration guidelines for implementing the Expand-Contract pattern in a multi-service architecture. The guide aims to ensure zero-downtime deployments and N-1 version compatibility when multiple services share the same database.
Key Changes:
- Establishes the Expand-Contract pattern as the standard approach for database migrations
- Provides detailed implementation guidelines, safety checks, and rollback procedures
- Includes practical code examples and anti-patterns to avoid
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Codecov Report✅ All modified and coverable lines are covered by tests.
Additional details and impacted files@@ Coverage Diff @@
## main #10519 +/- ##
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- Coverage 39.27% 32.10% -7.17%
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Files 1516 1364 -152
Lines 88624 62528 -26096
Branches 10671 9266 -1405
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- Hits 34805 20077 -14728
+ Misses 52734 41437 -11297
+ Partials 1085 1014 -71
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Actionable comments posted: 1
🧹 Nitpick comments (1)
src/backend/base/langflow/alembic/DB-MIGRATION-GUIDE.MD (1)
65-65: Minor documentation polish: Fix typo and clarify database compatibility.Line 65 has a typo: "N days Contract cicle" should be "cycle". Additionally, the Mermaid diagram description (lines 56-60) references specific colors that may render differently across systems—consider removing precise color claims or noting they're approximate.
The SQL examples throughout (lines 113-117, 356-366, 469-494) use PostgreSQL-specific syntax (e.g.,
FILTERclause,INTERVALfunction). Consider adding a compatibility note early in the guide to clarify the examples assume PostgreSQL, or adjust syntax for broader database compatibility.Also applies to: 56-60
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src/backend/base/langflow/alembic/DB-MIGRATION-GUIDE.MD(1 hunks)
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📓 Common learnings
Learnt from: CR
Repo: langflow-ai/langflow PR: 0
File: .cursor/rules/backend_development.mdc:0-0
Timestamp: 2025-07-18T18:25:54.486Z
Learning: Applies to src/backend/base/langflow/services/database/models/**/*.py : Place database models in src/backend/base/langflow/services/database/models/
🪛 markdownlint-cli2 (0.18.1)
src/backend/base/langflow/alembic/DB-MIGRATION-GUIDE.MD
512-512: Fenced code blocks should have a language specified
(MD040, fenced-code-language)
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🔇 Additional comments (1)
src/backend/base/langflow/alembic/DB-MIGRATION-GUIDE.MD (1)
1-478: Comprehensive and well-structured database migration guide.The documentation provides excellent guidance on the Expand-Contract pattern with clear principles, practical code examples, and safety considerations. The structure flows logically through each phase, includes concrete anti-patterns to avoid, and emphasizes N-1 version compatibility appropriately.
The code examples demonstrate solid understanding of Alembic patterns (idempotency checks, inspector usage, proper error handling) and the safety/monitoring sections provide valuable practices for production deployments.
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src/backend/base/langflow/alembic/DB-MIGRATION-GUIDE.MD:514
- Unclosed code fence: the SQL code block starting at line 481 is never closed with closing backticks, which will cause the markdown to render incorrectly.
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~LGTM!
I think this looks good. I dont see any super obvious issues and it seems pretty self isolated so if someone isn't migrating anything the precommit hooks sound pass
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Hi guys, we still need to define:
1- The approval process for the submitted migration and the people responsible for it.
2- The contract phase period, if we're going to use one (problematic because I believe we don't have a limit for hibernation)
This pull request introduces a comprehensive system for validating and testing Alembic database migrations to ensure compliance with the Expand-Contract migration pattern. It adds automated GitHub Actions for migration validation on pull requests, provides a migration generator script for compliant migrations, and includes test scripts for both static validation and live database testing.
CI/CD Automation for Migration Validation:
.github/workflows/migration-validation.yml) that automatically validates any changed Alembic migration files in pull requests. The workflow:Migration Authoring Tools:
scripts/generate_migration.py, a script to generate Alembic migration templates that are compliant with the Expand-Contract pattern. The script provides templates for EXPAND, MIGRATE, and CONTRACT phases, with embedded instructions, checks, and best practices.Migration Validation and Testing:
scripts/test_validator.py, a test suite for the migration validator logic. It creates temporary migration files to test detection of correct and incorrect migration patterns, phase detection, and common mistakes, ensuring the validator logic works as intended.scripts/test_with_database.py, a script to test the application of migrations against a real SQLite database, verifying schema changes are applied correctly.