Split part and reaction_part

Now, reactions should always end up on the bottom of a message group,
instead of sometimes being in the middle.

scripts/check-migrate.js

@@ -0,0 +1,15 @@
+// @ts-check
+
+// Trigger the database migration flow and exit after committing.
+// You can use this to run migrations locally and check the result using sqlitebrowser.
+
+const sqlite = require("better-sqlite3")
+
+const config = require("../config")
+const passthrough = require("../passthrough")
+const db = new sqlite("db/ooye.db")
+const migrate = require("../db/migrate")
+
+Object.assign(passthrough, {config, db })
+
+migrate.migrate(db)