Enhancement/unify migrations#249
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## Summary - Consolidated migration system from mixed Knex + node-pg-migrate to unified Knex approach - Standardized all migrations to Knex.js format (JavaScript files) - Removed duplicate migration definitions and conflicting tools ## Changes ### Migrations - Created comprehensive Knex migrations for all schema components: - invoices table with full schema and multi-tenant support - users, tenants, and api_keys for multi-tenant architecture - escrow_operations, escrow_summaries for transaction tracking - audit_log_events (append-only ledger with DB-level enforcement) - retention_policies, legal_holds, and retention audit logging - escrow event indexing tables for off-chain projection ### Configuration - Updated package.json to use only Knex migration commands - Removed duplicate \db:migrate\ script (node-pg-migrate took precedence) - All migration scripts now use: \knex migrate:latest\, \knex migrate:rollback\, etc. ### Documentation - Updated DB_MIGRATIONS.md with comprehensive Knex documentation - Added troubleshooting guides for common issues - Documented PostgreSQL-specific features (RLS, triggers) - Added production deployment best practices ### Testing - Updated migration integration tests to validate Knex migrations - Tests verify schema correctness for both SQLite and PostgreSQL - Added migration execution, rollback, and idempotency tests ### Removed - ❌ Removed node-pg-migrate configuration (migrator-config.js now unused) - ❌ Removed duplicate initial schema migrations - ❌ Removed old SQL-only migrations ## Benefits ✅ Single migration tool (Knex) - easier maintenance ✅ Supports multiple databases (SQLite dev/test, PostgreSQL prod) ✅ Better error handling and transaction support ✅ Clear separation of dev/test/prod configurations ✅ Comprehensive test coverage for migrations ## Testing - Migration structure validates correctly - All tables create successfully on fresh database - Idempotent migrations (safe to run multiple times) - Rollback capability verified Related to Liquifact#212: Unify migration tooling
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closes #212