Implement error handling in app.py, update deployment instructions in README_DASHBOARD.md, and modify deploy.sh for rsync-based deployment. Adjust base.html to safely access session variables.

app.py

@@ -1,4 +1,6 @@
 from flask import Flask, render_template, request, redirect, url_for, session, flash
+import traceback
+import sys
 import config
 from auth_helpers import verify_admin
 from db import get_cursor
@@ -7,6 +9,20 @@ app = Flask(__name__)
 app.secret_key = config.SECRET_KEY
 
 
+@app.errorhandler(500)
+def handle_500(e):
+    tb = traceback.format_exc()
+    print(tb, file=sys.stderr, flush=True)
+    # Show traceback in response for debugging (remove in production if desired)
+    escaped = tb.replace("<", "&lt;").replace(">", "&gt;")
+    return (
+        "<h1>Internal Server Error</h1>"
+        "<p>The error has been logged. Details below (also in journalctl -u portal-auth-dashboard):</p>"
+        "<pre style='white-space:pre-wrap;font-size:small'>" + escaped + "</pre>",
+        500,
+    )
+
+
 def login_required(f):
     from functools import wraps
     @wraps(f)
@@ -68,12 +84,12 @@ def table_view(name):
     with get_cursor() as cur:
         cur.execute(f'SELECT * FROM "{name}" ORDER BY 1 DESC LIMIT 500')
         rows = cur.fetchall()
-    # Convert dict rows to list of dicts with string values for display; keep raw row for actions (e.g. session_id, id)
+    # Convert to plain dicts so Jinja and serialization don't hit RealDictRow issues
     data = []
+    raw_rows = []
     for r in rows:
         data.append({k: (str(v) if v is not None else "") for k, v in r.items()})
-    # Keep original rows for action URLs (session_id, id) so we don't rely on truncated display
-    raw_rows = rows
+        raw_rows.append(dict(r))
     columns = list(rows[0].keys()) if rows else TABLE_COLUMNS.get(name, [])
     return render_template("table.html", table_name=name, rows=data, raw_rows=raw_rows, columns=columns)