diff --git a/migrations/postgres/20260411000000_plugin_config_jsonb_to_text.sql b/migrations/postgres/20260411000000_plugin_config_jsonb_to_text.sql
index 19c738a..141f5c9 100644
--- a/migrations/postgres/20260411000000_plugin_config_jsonb_to_text.sql
+++ b/migrations/postgres/20260411000000_plugin_config_jsonb_to_text.sql
@@ -1 +1,25 @@
+-- Convert plugin_configs.config from JSONB to TEXT for cross-database consistency.
 ALTER TABLE plugin_configs ALTER COLUMN config TYPE TEXT USING config::TEXT;
+
+-- Fix remaining TIMESTAMPTZ columns in plugin tables that were missed by
+-- 20260327000000_plugin_tables_timestamptz_to_text.sql.
+-- sqlx's AnyPool does not support native Postgres TIMESTAMPTZ.
+
+ALTER TABLE plugin_configs
+    ALTER COLUMN updated_at TYPE TEXT USING updated_at::text;
+ALTER TABLE plugin_configs
+    ALTER COLUMN updated_at SET DEFAULT '';
+
+ALTER TABLE plugins
+    ALTER COLUMN loaded_at TYPE TEXT USING loaded_at::text;
+
+ALTER TABLE plugin_dedup_keys
+    ALTER COLUMN updated_at TYPE TEXT USING updated_at::text;
+ALTER TABLE plugin_dedup_keys
+    ALTER COLUMN updated_at SET DEFAULT '';
+
+ALTER TABLE plugin_kv
+    ALTER COLUMN expires_at TYPE TEXT USING expires_at::text,
+    ALTER COLUMN created_at TYPE TEXT USING created_at::text;
+ALTER TABLE plugin_kv
+    ALTER COLUMN created_at SET DEFAULT '';