feat(commands): add management command for database setup

- creates an admin connection
- resets database users and databases
- validates the database configuration
- checks if a user/database exists
- creates a user/database
- checks schema permissions
- runs migrations
- ensures a superuser exists

Author: lalver1

pems/core/management/__init__.py

@@ -48,7 +48,7 @@ preserve_blank_lines = true
 use_gitignore = true
 
 [tool.pytest.ini_options]
-DJANGO_SETTINGS_MODULE = "pems.settings"
+DJANGO_SETTINGS_MODULE = "tests.pytest.settings"
 
 [tool.setuptools.packages.find]
 include = ["pems*"]

pems/core/management/commands/__init__.py

@@ -0,0 +1,35 @@
+import psycopg
+import pytest
+
+
+@pytest.fixture
+def mock_psycopg_cursor(mocker):
+    cursor = mocker.MagicMock(spec=psycopg.Cursor)
+    cursor.fetchone.return_value = None
+    cursor.close = mocker.MagicMock()
+    return cursor
+
+
+@pytest.fixture
+def mock_admin_connection(mocker, mock_psycopg_cursor):
+    connection = mocker.MagicMock(spec=psycopg.Connection)
+    connection.cursor.return_value = mock_psycopg_cursor
+    connection.closed = False
+
+    def mock_close():
+        connection.closed = True
+
+    connection.close = mock_close
+    return connection
+
+
+@pytest.fixture
+def mock_os_environ(mocker):
+    env_dict = {}
+    mocker.patch("os.environ", env_dict)
+    return env_dict
+
+
+@pytest.fixture
+def mock_psycopg_connect(mocker):
+    return mocker.patch("psycopg.connect")