feat: add worker job-claim logic

worker/tests/test_claim.py

@@ -0,0 +1,26 @@
+from lyra_worker.claim import claim_next
+from tests.conftest import insert_request
+
+
+def test_claim_returns_none_when_empty(conn):
+    assert claim_next(conn) is None
+
+
+def test_claim_advances_job_to_matching(conn):
+    job_id = insert_request(conn)
+    claimed = claim_next(conn)
+    assert claimed == job_id
+
+    with conn.cursor() as cur:
+        cur.execute('SELECT state, "currentStage", attempts, "claimedAt" FROM "Job" WHERE id = %s', (job_id,))
+        state, stage, attempts, claimed_at = cur.fetchone()
+    assert state == "matching"
+    assert stage == "match"
+    assert attempts == 1
+    assert claimed_at is not None
+
+
+def test_claim_does_not_repick_claimed_job(conn):
+    insert_request(conn)
+    assert claim_next(conn) is not None
+    assert claim_next(conn) is None