add the delete cases api

app.py

@@ -422,6 +422,21 @@ def get_case(case_id):
     return jsonify({"case": case, "actions": case_actions, "audit_logs": case_audits})
 
 
+@app.route("/api/cases", methods=["DELETE"])
+@jwt_required()
+def delete_all_cases():
+    count = len(db["cases"])
+    db["cases"].clear()
+    db["actions"].clear()
+    db["audit_logs"].clear()
+    return (
+        jsonify(
+            {"status": "ok", "message": f"Deleted {count} case(s) and all related data"}
+        ),
+        200,
+    )
+
+
 @app.route("/api/health")
 def health():
     return jsonify({"status": "ok"}), 200