Haproxy route policy switch default db to postgresql

docs/release-notes/artifacts/pr0413.yaml

@@ -0,0 +1,17 @@
+version_schema: 2
+
+changes:
+  - title: Switched haproxy-route-policy database backend to PostgreSQL
+    author: tphan025
+    type: minor
+    description: >
+      Changed the default database backend from SQLite to PostgreSQL with
+      environment-variable-based configuration for host, port, user, password,
+      and database name. Added psycopg2-binary as a project dependency.
+    urls:
+      pr:
+        - https://github.com/canonical/haproxy-operator/pull/413
+      related_doc:
+      related_issue:
+    visibility: public
+    highlight: false

haproxy-route-policy/haproxy_route_policy/settings.py

@@ -16,6 +16,7 @@
 from pathlib import Path
 import os
 import json
+import psycopg2.extensions
 
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent
@@ -76,9 +77,16 @@
 
 DATABASES = {
     "default": {
-        "ENGINE": "django.db.backends.sqlite3",
-        "NAME": BASE_DIR / "db.sqlite3",
-    }
+        "ENGINE": "django.db.backends.postgresql",
+        "PASSWORD": os.getenv("DJANGO_DATABASE_PASSWORD", ""),
+        "HOST": os.getenv("DJANGO_DATABASE_HOST", "localhost"),
+        "PORT": os.getenv("DJANGO_DATABASE_PORT", 5432),
+        "USER": os.getenv("DJANGO_DATABASE_USER", "postgres"),
+        "NAME": os.getenv("DJANGO_DATABASE_NAME", "postgres"),
+        "OPTIONS": {
+            "isolation_level": psycopg2.extensions.ISOLATION_LEVEL_SERIALIZABLE,
+        },
+    },
 }
 
 

haproxy-route-policy/pyproject.toml

@@ -8,6 +8,7 @@ dependencies = [
     "django>=6.0.3",
     "djangorestframework>=3.16.1",
     "djangorestframework-simplejwt>=5.5.1",
+    "psycopg2-binary>=2.9.11",
     "validators>=0.35.0",
     "whitenoise>=6.12.0",
 ]