feat: add database & auth manager classes

db/database.py

@@ -0,0 +1,36 @@
+import os
+import psycopg2
+
+
+class PostgresConnector:
+    """
+    Simple PostgreSQL connector (single connection).
+    """
+
+    def __init__(self):
+        self.connection = psycopg2.connect(
+            host=os.getenv("POSTGRES_HOST", "localhost"),
+            port=os.getenv("POSTGRES_PORT", 5432),
+            user=os.getenv("POSTGRES_USER", "postgres"),
+            password=os.getenv("POSTGRES_PASSWORD", "postgres"),
+            database=os.getenv("POSTGRES_DB", "postgres"),
+        )
+        self.connection.autocommit = False
+
+    def execute(self, query, params=None, fetch=False):
+        with self.connection.cursor() as cursor:
+            cursor.execute(query, params)
+
+            if fetch:
+                return cursor.fetchall()
+
+            self.connection.commit()
+
+    def executemany(self, query, param_list):
+        with self.connection.cursor() as cursor:
+            cursor.executemany(query, param_list)
+            self.connection.commit()
+
+    def close(self):
+        if self.connection:
+            self.connection.close()