Use uv build backend

uv's build backend expects our module to be in src.

src/dspace_statistics_api/database.py

@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
+import falcon
+import psycopg
+
+from .config import (
+    DATABASE_HOST,
+    DATABASE_NAME,
+    DATABASE_PASS,
+    DATABASE_PORT,
+    DATABASE_USER,
+)
+
+
+class DatabaseManager:
+    """Manage database connection."""
+
+    def __init__(self):
+        self._connection_uri = f"dbname={DATABASE_NAME} user={DATABASE_USER} password={DATABASE_PASS} host={DATABASE_HOST} port={DATABASE_PORT}"
+
+    def __enter__(self):
+        try:
+            self._connection = psycopg.connect(
+                self._connection_uri, row_factory=psycopg.rows.dict_row
+            )
+        except psycopg.OperationalError:
+            title = "500 Internal Server Error"
+            description = "Could not connect to database"
+            raise falcon.HTTPInternalServerError(title, description)
+
+        return self._connection
+
+    def __exit__(self, exc_type, exc_value, exc_traceback):
+        self._connection.close()
+
+
+# vim: set sw=4 ts=4 expandtab: