feat: add worker loop and production Dockerfiles

worker/lyra_worker/main.py

@@ -0,0 +1,28 @@
+import time
+
+from lyra_worker.claim import claim_next
+from lyra_worker.db import connect
+from lyra_worker.pipeline import run_pipeline
+
+IDLE_SLEEP = 2.0
+STAGE_DELAY = 1.0  # visible progress in the UI
+
+
+def run_forever() -> None:
+    conn = connect()
+    print("worker: waiting for jobs", flush=True)
+    try:
+        while True:
+            job_id = claim_next(conn)
+            if job_id is None:
+                time.sleep(IDLE_SLEEP)
+                continue
+            print(f"worker: claimed job {job_id}", flush=True)
+            run_pipeline(conn, job_id, stage_delay=STAGE_DELAY)
+            print(f"worker: imported job {job_id}", flush=True)
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    run_forever()