feat: add migration tracker table (#578)

packages/db/postgres/tables.sql

@@ -175,3 +175,14 @@ CREATE TABLE IF NOT EXISTS pin_sync_request
   pin_id          BIGINT                                                        NOT NULL UNIQUE REFERENCES pin (id),
   inserted_at     TIMESTAMP WITH TIME ZONE DEFAULT timezone('utc'::text, now()) NOT NULL
 );
+
+-- A migration tracker.
+CREATE TABLE IF NOT EXISTS migration_tracker
+(
+  id              BIGSERIAL PRIMARY KEY,
+  cid             TEXT                                                          NOT NULL,
+  duration        BIGINT,
+  dump_started_at TIMESTAMP WITH TIME ZONE,
+  dump_ended_at   TIMESTAMP WITH TIME ZONE NOT NULL,
+  inserted_at     TIMESTAMP WITH TIME ZONE DEFAULT timezone('utc'::text, now()) NOT NULL
+)