TT-002 — Drift Database Schema

Type: Story
Priority: Highest
Labels: database, infrastructure
Depends on: TT-001
Blocks: TT-004, TT-005

Summary

Implement the full Drift database schema in lib/core/database/app_database.dart including all table definitions, DAOs, and the database connection provider.

Background

The Drift schema is documented in .ai/database.md. The placeholder file lib/core/database/app_database.dart exists but contains no implementation.

Data Model

Tables

Table	Key columns
`projects`	id, name, color_value, description, archived_at, created_at
`time_entries`	id, project_id (FK), start_time, end_time, duration_s, note, created_at
`tags`	id, name
`time_entry_tags`	time_entry_id (FK), tag_id (FK) — composite PK

Acceptance Criteria

All 4 tables defined as Drift Table classes
Foreign key constraints declared and enforced
AppDatabase annotated with @DriftDatabase(tables: [...])
_openConnection() uses getApplicationDocumentsDirectory() + NativeDatabase.createInBackground
schemaVersion = 1, empty MigrationStrategy scaffold in place
Three DAOs created: ProjectsDao, TimeEntriesDao, TagsDao
Each DAO has at minimum: watchAll(), insert(), update(), delete()
TimeEntriesDao.getActiveEntry() returns entry where end_time IS NULL
Riverpod @Riverpod(keepAlive: true) provider for AppDatabase
dart run build_runner build generates schema without errors
Unit test: insert + read a Project using in-memory DB

Files to create / modify

lib/core/database/app_database.dart — full implementation
lib/core/database/daos/projects_dao.dart
lib/core/database/daos/time_entries_dao.dart
lib/core/database/daos/tags_dao.dart
test/core/database/app_database_test.dart

Notes

See .ai/database.md for full schema details
Use NativeDatabase.memory() in tests — never the real file DB

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