claude-code-chat-browser: schema drift detection for upstream JSONL changes (#5)

Fingerprint known Claude Code JSONL field paths against a committed
schema_baseline.json, warn on drift during parsing, expose GET
/api/schema-report, and surface a dismissible amber banner on the
session list page. Warnings only - parsing is never blocked.

Author: clean6378-max-it

api/schema_report.py

@@ -0,0 +1,14 @@
+"""Schema drift report endpoint."""
+
+from flask import Blueprint
+
+from api._flask_types import FlaskReturn, json_response
+from utils.schema_drift import get_schema_report
+
+schema_report_bp = Blueprint("schema_report", __name__)
+
+
+@schema_report_bp.route("/api/schema-report")
+def schema_report() -> FlaskReturn:
+    """Return known/new/missing JSONL field paths from recent parse runs."""
+    return json_response(get_schema_report())

app.py

@@ -9,6 +9,7 @@
 
 from api.export_api import export_bp
 from api.projects import projects_bp
+from api.schema_report import schema_report_bp
 from api.search import search_bp
 from api.sessions import sessions_bp
 from utils.exclusion_rules import load_rules, resolve_exclusion_rules_path
@@ -101,6 +102,7 @@ def create_app(
     app.register_blueprint(sessions_bp)
     app.register_blueprint(search_bp)
     app.register_blueprint(export_bp)
+    app.register_blueprint(schema_report_bp)
 
     @app.after_request
     def set_security_headers(response):