update claude.md
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### Database
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PostgreSQL via `DbExecutor` singleton — a custom async query executor using raw Npgsql (no ORM). Parameterized queries use reflection on anonymous objects. Migration scripts in `Database/` are numbered 001–011 and must run in order (each script's dependencies come before it).
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PostgreSQL via `DbExecutor` singleton — a custom async query executor using raw Npgsql (no ORM). Parameterized queries use reflection on anonymous objects. Migration scripts in `Database/` are numbered 001–011 and must run in order (each script's dependencies come before it). **All database changes must be backwards-compatible with the existing production database — never drop tables, columns, or alter data in ways that could cause data loss. Use additive migrations (ADD COLUMN, CREATE TABLE, etc.) and `IF NOT EXISTS` guards where appropriate.**
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### File Storage
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