- [x] 1.1 Add OpenSpec requirements and context for SQLite startup validation mode and SQLite query-path tuning
- [x] 1.2 Add runtime support for configurable SQLite startup validation with default `quick`
- [x] 1.3 Add the new usage-history and request-log indexes through Alembic and ORM metadata
- [x] 1.4 Update usage-history and request-log repositories to use the new query shape without changing API behavior
- [x] 1.5 Add regression tests for startup validation mode, migration/index creation, and query behavior
