feat: PostgreSQL подключение, переменные в .env.example

site/app.py

@@ -1,16 +1,38 @@
+import os
+import psycopg2
+from dotenv import load_dotenv
 from flask import Flask, render_template
 
+load_dotenv()
+
 class ContractsApp:
     def __init__(self):
         self.app = Flask(__name__)
+        self.db = self._connect_db()
         self.add_routes()
 
+    def _connect_db(self):
+        try:
+            conn = psycopg2.connect(
+                host=os.getenv("DB_HOST"),
+                port=os.getenv("DB_PORT", 5432),
+                dbname=os.getenv("DB_NAME"),
+                user=os.getenv("DB_USER"),
+                password=os.getenv("DB_PASS"),
+                sslmode=os.getenv("DB_SSLMODE", "disable"),
+            )
+            return conn
+        except Exception as e:
+            print(f"DB connect error: {e}")
+            return None
+
     def add_routes(self):
         self.app.add_url_rule("/", "index", self.index)
         self.app.add_url_rule("/health", "health", self.health)
 
     def index(self):
-        return render_template("index.html")
+        db_status = "connected" if self.db else "no DB"
+        return render_template("index.html", db_status=db_status)
 
     def health(self):
         return "OK", 200, {"Content-Type": "text/plain"}