perf: keep planning reads available during writes (Closes #699)

tests/test_later_store.py

@@ -65,6 +65,23 @@ def test_deferrals_are_durable_revisioned_idempotent_and_account_scoped(tmp_path
     ) == {"revision": 2, "records": {}}
 
 
+def test_initialized_later_reads_remain_available_during_a_planning_write(tmp_path):
+    path = tmp_path / "later.sqlite3"
+    store = LaterStore(path, timeout=0.05)
+    expected = store.apply(
+        "timmy", "seed", "defer", "issue:r:1:",
+        wake_at="2026-08-10T09:00:00.000Z",
+    )
+
+    writer = sqlite3.connect(path)
+    writer.execute("BEGIN IMMEDIATE")
+    try:
+        assert LaterStore(path, timeout=0.05).get("timmy") == expected
+    finally:
+        writer.rollback()
+        writer.close()
+
+
 def test_batch_applies_in_one_ordered_idempotent_unit(tmp_path):
     store = LaterStore(tmp_path / "later.sqlite3")
     operations = [

tests/test_today_store.py

@@ -67,6 +67,20 @@ def test_operations_are_durable_ordered_idempotent_and_account_scoped(tmp_path):
     }
 
 
+def test_initialized_today_reads_remain_available_during_a_planning_write(tmp_path):
+    path = tmp_path / "today.sqlite3"
+    store = TodayStore(path, timeout=0.05)
+    expected = store.apply("timmy", "seed", "add", "issue:r:1:")
+
+    writer = sqlite3.connect(path)
+    writer.execute("BEGIN IMMEDIATE")
+    try:
+        assert TodayStore(path, timeout=0.05).get("timmy") == expected
+    finally:
+        writer.rollback()
+        writer.close()
+
+
 def test_capacity_and_estimates_are_durable_account_scoped_and_follow_item_identity(tmp_path):
     path = tmp_path / "today.sqlite3"
     store = TodayStore(path, limit=3)