ci(postgres): drop the checker's unit test

Remove erpnext/tests/test_postgres_compat.py (and its pre-commit exclude); a unit
test for the dev-tooling lint helper isn't needed in the app test suite.

.pre-commit-config.yaml

@@ -75,8 +75,8 @@ repos:
         language: script
         files: ^erpnext/.*\.py$
         # patches/ are historical, version-gated migrations (skipped on fresh Postgres installs);
-        # out of scope for the always-on gate. test_postgres_compat.py holds intentional bad-SQL fixtures.
-        exclude: ^erpnext/patches/|^erpnext/tests/test_postgres_compat\.py$
+        # out of scope for the always-on gate.
+        exclude: ^erpnext/patches/
 
 ci:
     autoupdate_schedule: weekly

erpnext/tests/test_postgres_compat.py

@@ -1,103 +0,0 @@
-# Copyright (c) 2026, Frappe Technologies Pvt. Ltd. and Contributors
-# See license.txt
-"""Unit tests for the .github/helper/postgres_compat.py pre-commit checker.
-
-This file is excluded from the postgres-compat hook itself (see .pre-commit-config.yaml)
-because the fixtures below intentionally contain MySQL-only SQL.
-"""
-
-import importlib.util
-import os
-import tempfile
-import unittest
-
-import frappe
-
-_HELPER = os.path.join(frappe.get_app_path("erpnext"), "..", ".github", "helper", "postgres_compat.py")
-_spec = importlib.util.spec_from_file_location("postgres_compat", _HELPER)
-pgc = importlib.util.module_from_spec(_spec)
-_spec.loader.exec_module(pgc)
-
-
-def violations(code: str) -> list[str]:
-	with tempfile.NamedTemporaryFile("w", suffix=".py", delete=False) as f:
-		f.write(code)
-		path = f.name
-	try:
-		return pgc.check_file(path)
-	finally:
-		os.unlink(path)
-
-
-class TestPostgresCompat(unittest.TestCase):
-	def _assert_flag(self, code: str, needle: str):
-		out = violations(code)
-		self.assertTrue(
-			any(needle in v for v in out), f"expected '{needle}' to be flagged in:\n{code}\ngot: {out}"
-		)
-
-	def _assert_clean(self, code: str):
-		self.assertEqual(violations(code), [], f"expected no flags in:\n{code}")
-
-	# --- catches the mechanical breaks ---
-	def test_timestamp_two_arg(self):
-		self._assert_flag(
-			'frappe.db.sql("select timestamp(posting_date, posting_time) from `tabSLE`")',
-			"timestamp(date, time)",
-		)
-
-	def test_show_index(self):
-		self._assert_flag('frappe.db.sql("show index from `tabItem`")', "SHOW INDEX")
-
-	def test_update_join(self):
-		self._assert_flag(
-			'frappe.db.sql("update `tabA` a join `tabB` b on a.x=b.x set a.y=b.y")', "UPDATE ... JOIN"
-		)
-
-	def test_single_quoted_alias(self):
-		self._assert_flag(
-			"frappe.db.sql(\"select substr(x,1,3) as 'foo' from `tabA`\")", "single-quoted column alias"
-		)
-
-	def test_group_concat(self):
-		self._assert_flag('frappe.db.sql("select group_concat(name) from `tabA`")', "group_concat()")
-
-	def test_set_value_bool(self):
-		self._assert_flag('frappe.db.set_value("Company", c, "some_check", True)', "bool")
-
-	def test_db_set_bool(self):
-		self._assert_flag('doc.db_set("is_default", False)', "bool")
-
-	def test_mysql_result_key(self):
-		self._assert_flag('row.get("Column_name")', "Column_name")
-
-	def test_fstring_sql(self):
-		self._assert_flag("frappe.db.sql(f\"select date_format(d, '%Y') from `tab{dt}`\")", "date_format()")
-
-	# --- does not false-positive on safe shapes ---
-	def test_ifnull_is_auto_translated(self):
-		self._assert_clean('frappe.db.sql("select ifnull(qty, 0) from `tabBin`")')
-
-	def test_like_is_ilike(self):
-		self._assert_clean('frappe.db.get_all("Item", filters={"item_name": ["like", "%x%"]})')
-
-	def test_prose_with_sql_words(self):
-		# a translatable message that merely contains "select" and "as '...'"
-		self._assert_clean(
-			"frappe.throw(_(\"Cannot select charge type as 'On Previous Row' for first row\"))"
-		)
-
-	def test_docstring_describing_rule(self):
-		self._assert_clean(
-			'def f():\n\t"""Avoid MariaDB-only DATE_FORMAT(); read from the pg_index catalog instead."""\n\treturn 1\n'
-		)
-
-	def test_qb_is_clean(self):
-		self._assert_clean("frappe.qb.from_(sle).select(CombineDatetime(sle.posting_date, sle.posting_time))")
-
-	def test_pg_ok_suppresses(self):
-		self._assert_clean('frappe.db.sql(  # pg-ok\n\t"show index from `tabItem`"\n)')
-
-
-if __name__ == "__main__":
-	unittest.main()