[jeffrey-graham]

Summary

Adds ReplicationPlugin (plugins/replication/index.ts) to replicate tables from an external data source (e.g., Supabase / PostgreSQL / MySQL / Turso / D1) into StarbaseDB's internal Durable Object SQLite database so the instance can serve as a low-latency close-to-edge replica.

Key Features

• Configurable Tables & Polling Intervals: Users can specify which tables to replicate (tables: (string | ReplicationTableConfig)[]), per-table or global intervalSeconds, and batchSize.
• Incremental Cursor / Watermark Tracking: Supports defining a cursorColumn (such as id or created_at) per table and persists the latest watermark in tmp_replication_state inside DO SQLite for append-only incremental polling (WHERE <cursorColumn> > ? ORDER BY <cursorColumn> ASC LIMIT ?).
• Automatic Local Table Provisioning & Upsert: Infers SQLite column types and primary keys on first pull (CREATE TABLE IF NOT EXISTS) and upserts rows via INSERT OR REPLACE INTO.
• HTTP & Query Lifecycle Hooks: Exposes GET /replication/status and admin-protected POST /replication/sync (for all tables or a single table), plus optional non-blocking background sync via ExecutionContext.waitUntil on beforeQuery.
• Unit Tests: Includes comprehensive Vitest unit test coverage in plugins/replication/index.test.ts.

Fixes #72
/claim #72

[jeffrey-graham]

Closing this PR to avoid adding duplicate noise on #72, since earlier ReplicationPlugin PRs (#75, #95) are already awaiting review and the bounty label on #72 is no longer active.