Taylor Eernisse d15f457a58 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>

2026-01-26 11:27:51 -05:00

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