Codewalkers/.planning/phases/02-data-layer/02-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	duration	completed
02-data-layer	01	database	drizzle sqlite better-sqlite3 orm schema	phase provides 01 Core infrastructure (CLI, server, process management)	SQLite database connection factory Task hierarchy schema (initiative -> phase -> plan -> task) Drizzle ORM types for all entities Task dependency relationship table	03-git-integration 04-agent-lifecycle 05-task-dispatch	added patterns drizzle-orm better-sqlite3 drizzle-kit factory-function-not-singleton wal-mode foreign-key-cascades	created modified src/db/config.ts src/db/index.ts src/db/schema.ts drizzle.config.ts package.json	Factory function (not singleton) for database - allows isolated test instances WAL mode enabled for better concurrent read performance Foreign keys enabled with cascade deletes for data integrity Unix timestamps (integers) for SQLite compatibility Separate task_dependencies table for many-to-many task relationships	Database factory: createDatabase(path?) returns isolated instance Schema organization: tables + relations + types in schema.ts Environment override: CW_DB_PATH for testing with :memory:	3min	2026-01-30

Phase 2 Plan 1: SQLite Database Setup Summary

SQLite database with Drizzle ORM and four-level task hierarchy schema (initiative -> phase -> plan -> task)

Performance

• Duration: 3 min
• Started: 2026-01-30T13:22:12Z
• Completed: 2026-01-30T13:24:59Z
• Tasks: 3
• Files modified: 5

Accomplishments

• Installed Drizzle ORM with better-sqlite3 driver for synchronous SQLite operations
• Created database connection factory with WAL mode and foreign key enforcement
• Defined complete task hierarchy schema with proper cascade delete relationships
• Exported TypeScript types for all entities (Initiative, Phase, Plan, Task, TaskDependency)
• Configured drizzle-kit for future migration support

Task Commits

Each task was committed atomically:

1. Task 1: Install Drizzle ORM and SQLite dependencies - caf8bb0 (chore)
2. Task 2: Create database connection factory - d7e4649 (feat)
3. Task 3: Define task hierarchy schema - b492f64 (feat)

Files Created/Modified

• src/db/config.ts - Database path resolution with CW_DB_PATH override
• src/db/index.ts - createDatabase() factory function with WAL mode
• src/db/schema.ts - Complete schema with 5 tables and relations
• drizzle.config.ts - Drizzle Kit configuration for migrations
• package.json - Added drizzle-orm, better-sqlite3, drizzle-kit dependencies

Decisions Made

• Factory over singleton: createDatabase() returns new instance each call, enabling isolated test databases
• WAL mode: Enabled for better concurrent read performance in local-first app
• Foreign keys on: SQLite has FK disabled by default, enabled for data integrity
• Unix timestamps: Used integer timestamps for SQLite compatibility vs Date objects
• Separate dependencies table: task_dependencies junction table instead of JSON array for proper relational queries

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Database foundation complete for repository layer implementation
• Schema ready for CRUD operations in Phase 2 Plan 2
• Types exported for use throughout codebase
• No blockers for continuing

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Phase: 02-data-layer Completed: 2026-01-30