feat(db): Add SQLite database migrations for GitLab data model
Implements a comprehensive relational schema for storing GitLab data with full audit trail and raw payload preservation. Migration 001_initial.sql establishes core metadata tables: - projects: Tracked GitLab projects with paths and namespace - sync_watermarks: Cursor-based incremental sync state per project - schema_migrations: Migration tracking with checksums for integrity Migration 002_issues.sql creates the issues data model: - issues: Core issue data with timestamps, author, state, counts - labels: Project-specific label definitions with colors/descriptions - issue_labels: Many-to-many junction for issue-label relationships - milestones: Project milestones with state and due dates - discussions: Threaded discussions linked to issues/MRs - notes: Individual notes within discussions with full metadata - raw_payloads: Compressed original API responses keyed by entity Migration 003_indexes.sql adds performance indexes: - Covering indexes for common query patterns (state, updated_at) - Composite indexes for filtered queries (project + state) Migration 004_discussions_payload.sql extends discussions: - Adds raw_payload column for discussion-level API preservation - Enables debugging and data recovery from original responses Migration 005_assignees_milestone_duedate.sql completes the model: - issue_assignees: Many-to-many for multiple assignees per issue - Adds milestone_id, due_date columns to issues table - Indexes for assignee and milestone filtering Schema supports both incremental sync and full historical queries. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Taylor Eernisse