feat: enhance roadmap with detailed tasks and acceptance criteria; update database documentation and query management

supabase/README.md

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+# Supabase Directory
+
+This directory stores SQL files for the project's Supabase/PostgreSQL database.
+
+## Current Baseline
+
+- `schema.sql` is the first registered database SQL file.
+- Its documentation is in `docs/database/0001-initial-schema.md`.
+- Its order is tracked in `docs/database/query-order.md`.
+- Execution history is tracked in `docs/database/query-log.md`.
+
+## Future Changes
+
+Future schema changes should be added under:
+
+```text
+supabase/migrations/
+```
+
+Do not overwrite already executed SQL without also creating a new ordered migration and documenting why.
+

supabase/migrations/.gitkeep

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+