Add database version system check

arkindex/project/checks.py

@@ -9,7 +9,8 @@ import os
 import re
 import sys
 
-from django.core.checks import Critical, Error, Warning, register
+from django.core.checks import Critical, Error, Tags, Warning, register
+from django.db import connections
 
 from arkindex.process.models import ArkindexFeature, WorkerVersion
 
@@ -350,3 +351,20 @@ def update_system_workers_check(*args, **kwargs):
              f"then update its `version` to {settings.VERSION!r}.",
         id="arkindex.E012",
     )]
+
+
+@register(Tags.database)
+def database_version_check(databases=None, **kwargs):
+    if databases is None:
+        return []
+
+    issues = []
+    for alias in databases:
+        major, minor = connections[alias].get_database_version()
+        if major < 15:
+            issues.append(Critical(
+                "Arkindex requires PostgreSQL 15 or later.",
+                hint=f"Database {alias} reports version {major}.{minor}",
+                id="arkindex.C002",
+            ))
+    return issues

arkindex/project/tests/test_checks.py

@@ -4,6 +4,7 @@ from unittest.mock import patch
 
 from django.conf import settings
 from django.core.checks import Critical, Error, Warning
+from django.db import connections
 from django.test import TestCase, override_settings
 from django.urls import path
 
@@ -479,3 +480,25 @@ class ChecksTestCase(TestCase):
                  "then update its `version` to '0.0.0'.",
             id="arkindex.E012",
         )])
+
+    def test_database_version_check_none(self):
+        from arkindex.project.checks import database_version_check
+
+        self.assertListEqual(database_version_check(), [])
+
+    def test_database_version_check_default(self):
+        from arkindex.project.checks import database_version_check
+
+        self.assertListEqual(database_version_check(["default"]), [])
+
+    @patch.object(connections["default"], "get_database_version", lambda: (14, 1))
+    def test_database_version_check_critical(self):
+        from arkindex.project.checks import database_version_check
+
+        self.assertListEqual(database_version_check(["default"]), [
+            Critical(
+                "Arkindex requires PostgreSQL 15 or later.",
+                hint="Database default reports version 14.1",
+                id="arkindex.C002",
+            )
+        ])