fix: harden retry JSON parsing and exempt personal auth routes

webui/static/hoover/api.js
  Guard retryRes.json() with .catch(() => null) so non-JSON
  responses (e.g. nginx 502/503) don't throw and lose the
  actual status code. Falls back to 'HTTP <status>' error string.

lib/db_sqlite.py
  Replace unsafe sql.split(';') loop with conn.executescript()
  which properly handles semicolons inside string literals.

webui/server.py
  Add _AUTH_PERSONAL set and _is_personal_auth() so personal
  auth operations (session, password, logout, webauthn creds)
  skip subsystem permission checks. Users with only firewall:read
  can now manage their own credentials without needing auth:rw.

lib/db_sqlite.py

@@ -168,7 +168,4 @@ class SQLiteBackend(Database):
 
     def _execute_direct(self, sql: str) -> None:
         """Execute raw SQL without prepared statements (for DDL)."""
-        for line in sql.split(";"):
-            line = line.strip()
-            if line:
-                self.conn.execute(line)
+        self.conn.executescript(sql)

webui/server.py

@@ -125,6 +125,18 @@ _AUTH_EXEMPT = {
     ("POST", "/api/auth/webauthn/authenticate-finish"),
 }
 
+# ── Personal auth routes (operates on own account, no subsystem permission needed) ──
+# These routes require a valid JWT but do NOT require an "auth" permission entry.
+# A user with only "firewall:read" can still view session, change password, logout, etc.
+_AUTH_PERSONAL = {
+    ("GET", "/api/auth/session"),
+    ("POST", "/api/auth/password"),
+    ("POST", "/api/auth/logout"),
+    ("GET", "/api/auth/webauthn/credentials"),
+}
+
+# Pattern: DELETE /api/auth/webauthn/creds/<id> — match prefix only
+
 
 def _subsystem_from_path(path: str) -> str | None:
     """Extract subsystem name from API path."""
@@ -136,6 +148,14 @@ def _subsystem_from_path(path: str) -> str | None:
     return None
 
 
+def _is_personal_auth(method: str, path: str) -> bool:
+    """Check if route is a personal auth operation (no subsystem permission needed)."""
+    if (method, path) in _AUTH_PERSONAL:
+        return True
+    # Personal credential deletion: DELETE /api/auth/webauthn/creds/<id>
+    return method == "DELETE" and path.startswith("/api/auth/webauthn/creds/")
+
+
 def _has_permission(perms: dict, subsystem: str, method: str) -> bool:
     """Check if user has permission for subsystem + method."""
     level = perms.get(subsystem)
@@ -188,9 +208,9 @@ def _auth_middleware():
 
     user_permissions = payload.get("permissions", {})
 
-    # Check subsystem permissions
+    # Check subsystem permissions (skip personal auth routes)
     subsystem = _subsystem_from_path(path)
-    if subsystem:
+    if subsystem and not _is_personal_auth(method, path):
         if subsystem not in user_permissions:
             return jsonify({"ok": False, "error": "forbidden"}), 403
         if not _has_permission(user_permissions, subsystem, method):

webui/static/hoover/api.js

@@ -176,17 +176,16 @@ export async function apiFetch(url, options = {}) {
                     headers['X-Session-Id'] = refreshedStored.session_id;
                 }
                 const retryRes = await fetch(url, { method, headers, body: options.body, credentials: 'same-origin', ...opts });
-                const json = await retryRes.json();
                 if (retryRes.ok) {
-                    return { ok: json.ok, data: json.ok ? json.data : json, error: null, status: retryRes.status };
+                    const json = await retryRes.json().catch(() => null);
+                    return { ok: json?.ok ?? true, data: json ? (json.ok ? json.data : json) : null, error: null, status: retryRes.status };
                 }
                 if (retryRes.status === 401) {
                     redirectLogin();
                     return { ok: false, data: null, error: 'Session expired', status: 401 };
                 }
-                if (!retryRes.ok) {
-                    return { ok: false, data: null, error: json.error || `HTTP ${retryRes.status}`, status: retryRes.status };
-                }
+                const json = await retryRes.json().catch(() => null);
+                return { ok: false, data: null, error: json?.error || `HTTP ${retryRes.status}`, status: retryRes.status };
             }
             redirectLogin();
             return { ok: false, data: null, error: 'Session expired', status: 401 };