feat: complete client runtime foundation

tests/test_state.py

@@ -1,9 +1,10 @@
 import tempfile
 import unittest
+import os
 from pathlib import Path
 from uuid import uuid4
 
-from archive_clients.state import ClientStore, CommandConflict
+from archive_clients.state import ClientStore, CommandConflict, JobConflict
 
 
 class ClientStoreTests(unittest.TestCase):
@@ -12,6 +13,7 @@ class ClientStoreTests(unittest.TestCase):
             database = Path(directory) / "state.db"
             store = ClientStore(database)
             store.initialize()
+            self.assertEqual(os.stat(database).st_mode & 0o777, 0o600)
             command_id = str(uuid4())
             first = store.accept_command(command_id, '{"b":2,"a":1}', '{"ok":true}')
             duplicate = ClientStore(database).accept_command(
@@ -23,6 +25,32 @@ class ClientStoreTests(unittest.TestCase):
             with self.assertRaises(CommandConflict):
                 store.accept_command(command_id, '{"a":2}', '{"ok":true}')
 
+    def test_job_definition_is_immutable_while_cursor_advances(self):
+        with tempfile.TemporaryDirectory() as directory:
+            store = ClientStore(Path(directory) / "state.db")
+            store.initialize()
+            store.save_job(
+                "job-1", '{"jobId":"job-1"}', "JOB_STATE_WAITING",
+                1, 2, False,
+            )
+            store.save_job(
+                "job-1", '{"jobId":"job-1"}', "JOB_STATE_RUNNING",
+                2, 3, False,
+            )
+            self.assertEqual(
+                store.job_snapshot_rows(["job-1"])[0]["revision"], 2
+            )
+            with self.assertRaisesRegex(JobConflict, "backwards"):
+                store.save_job(
+                    "job-1", '{"jobId":"job-1"}', "JOB_STATE_WAITING",
+                    1, 2, False,
+                )
+            with self.assertRaises(JobConflict):
+                store.save_job(
+                    "job-1", '{"jobId":"other"}', "JOB_STATE_RUNNING",
+                    2, 3, False,
+                )
+
 
 if __name__ == "__main__":
     unittest.main()