Handle delivery log partition identities

Co-authored-by: npub1t2tgm7d8f995uqvmnm8h88sg3wnpp9a5xysjf6dg3tjmgt3ltulqdp8ehr <5a968df9a7494b4e019b9ecf739e088ba61097b4312124e9a88ae5b42e3f5f3e@sprout-oss.stage.blox.sqprod.co>
Signed-off-by: npub1t2tgm7d8f995uqvmnm8h88sg3wnpp9a5xysjf6dg3tjmgt3ltulqdp8ehr <5a968df9a7494b4e019b9ecf739e088ba61097b4312124e9a88ae5b42e3f5f3e@sprout-oss.stage.blox.sqprod.co>

scripts/attach-schema-partitions.sql

@@ -81,11 +81,19 @@ BEGIN
             FOR VALUES FROM ('2026-07-01') TO (MAXVALUE);
     END IF;
 
+    -- When pgschema creates partition children as standalone tables, it also
+    -- preserves the parent's identity column on delivery_log children. PostgreSQL
+    -- rejects attaching a child table that has its own identity column, so each
+    -- delivery_log attach path drops that standalone identity first. Raw
+    -- schema-created partitions are already attached, so these branches do not
+    -- run against inherited partition columns.
+
     IF NOT EXISTS (
         SELECT 1 FROM pg_inherits
         WHERE inhparent = 'delivery_log'::regclass
           AND inhrelid = 'delivery_log_p_past'::regclass
     ) THEN
+        ALTER TABLE delivery_log_p_past ALTER COLUMN id DROP IDENTITY IF EXISTS;
         ALTER TABLE delivery_log ATTACH PARTITION delivery_log_p_past
             FOR VALUES FROM (MINVALUE) TO ('2026-03-01');
     END IF;
@@ -95,6 +103,7 @@ BEGIN
         WHERE inhparent = 'delivery_log'::regclass
           AND inhrelid = 'delivery_log_p2026_03'::regclass
     ) THEN
+        ALTER TABLE delivery_log_p2026_03 ALTER COLUMN id DROP IDENTITY IF EXISTS;
         ALTER TABLE delivery_log ATTACH PARTITION delivery_log_p2026_03
             FOR VALUES FROM ('2026-03-01') TO ('2026-04-01');
     END IF;
@@ -104,6 +113,7 @@ BEGIN
         WHERE inhparent = 'delivery_log'::regclass
           AND inhrelid = 'delivery_log_p2026_04'::regclass
     ) THEN
+        ALTER TABLE delivery_log_p2026_04 ALTER COLUMN id DROP IDENTITY IF EXISTS;
         ALTER TABLE delivery_log ATTACH PARTITION delivery_log_p2026_04
             FOR VALUES FROM ('2026-04-01') TO ('2026-05-01');
     END IF;
@@ -113,6 +123,7 @@ BEGIN
         WHERE inhparent = 'delivery_log'::regclass
           AND inhrelid = 'delivery_log_p2026_05'::regclass
     ) THEN
+        ALTER TABLE delivery_log_p2026_05 ALTER COLUMN id DROP IDENTITY IF EXISTS;
         ALTER TABLE delivery_log ATTACH PARTITION delivery_log_p2026_05
             FOR VALUES FROM ('2026-05-01') TO ('2026-06-01');
     END IF;
@@ -122,6 +133,7 @@ BEGIN
         WHERE inhparent = 'delivery_log'::regclass
           AND inhrelid = 'delivery_log_p2026_06'::regclass
     ) THEN
+        ALTER TABLE delivery_log_p2026_06 ALTER COLUMN id DROP IDENTITY IF EXISTS;
         ALTER TABLE delivery_log ATTACH PARTITION delivery_log_p2026_06
             FOR VALUES FROM ('2026-06-01') TO ('2026-07-01');
     END IF;
@@ -131,6 +143,7 @@ BEGIN
         WHERE inhparent = 'delivery_log'::regclass
           AND inhrelid = 'delivery_log_p_future'::regclass
     ) THEN
+        ALTER TABLE delivery_log_p_future ALTER COLUMN id DROP IDENTITY IF EXISTS;
         ALTER TABLE delivery_log ATTACH PARTITION delivery_log_p_future
             FOR VALUES FROM ('2026-07-01') TO (MAXVALUE);
     END IF;