Set entity columns to be 'timestamp with time zone' to avoid TZ-relat…

…ed test failures (#4720)

database/migrations/000107_entity_properties_timestamp_tz.down.sql

@@ -0,0 +1,28 @@
+-- Copyright 2024 Stacklok, Inc
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--      http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+BEGIN;
+
+SET timezone = 'UTC';
+ALTER TABLE properties
+  ALTER COLUMN updated_at TYPE TIMESTAMP,
+  ALTER updated_at SET DEFAULT NOW();  -- Default needs to be set explicitly after type change
+
+ALTER TABLE entity_instances
+    ALTER created_at TYPE TIMESTAMP,
+    ALTER created_at SET DEFAULT NOW();
+
+-- There are more TIMESTAMP columns, but these are affecting unit tests in some timezones.
+
+COMMIT;

database/migrations/000107_entity_properties_timestamp_tz.up.sql

@@ -0,0 +1,32 @@
+-- Copyright 2024 Stacklok, Inc
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--      http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+BEGIN;
+
+-- Postgres only needs to rewrite metadata (and not the column data) when altering
+-- a column from timezoneless when timezone='UTC' is set in the session.
+-- Ref: https://www.postgresql.org/docs/release/12.0/
+
+SET timezone = 'UTC';
+ALTER TABLE properties
+  ALTER COLUMN updated_at TYPE TIMESTAMPTZ,
+  ALTER updated_at SET DEFAULT NOW()::timestamptz;  -- Default needs to be set explicitly after type change
+
+ALTER TABLE entity_instances
+    ALTER created_at TYPE TIMESTAMPTZ,
+    ALTER created_at SET DEFAULT NOW()::timestamptz;
+
+-- There are more TIMESTAMP columns, but these are affecting unit tests in some timezones.
+
+COMMIT;