feat: implement WebADIS authentication and add medianumber retrieval functionality

tests/test_migrations_runner.py

@@ -0,0 +1,20 @@
+import sqlite3 as sql
+from pathlib import Path
+
+from src.backend.database import Database
+
+p = Path("devtests_test_migrations.db")
+if p.exists():
+    p.unlink()
+
+print("Creating Database at", p)
+db = Database(db_path=p)
+
+conn = sql.connect(p)
+c = conn.cursor()
+c.execute("SELECT name FROM sqlite_master WHERE type='table'")
+print("Tables:", sorted([r[0] for r in c.fetchall()]))
+
+c.execute("SELECT id, applied_at FROM schema_migrations")
+print("Migrations applied:", c.fetchall())
+conn.close()