feat: security hardening — SSRF guard, template sandbox timeout, webhook log prune, auth & backup polish

- Add outbound URL validation (SSRF) for webhook/Discord/Slack/ntfy/Matrix dispatch
- Template renderer: input/output caps and thread-based render timeout
- Webhook log filter: strip Authorization/signature/token-like headers; atomic prune
- Auth/JWT/backup/config tightening; misc frontend UX fixes

packages/server/src/notify_bridge_server/database/migrations.py

@@ -18,8 +18,23 @@ logger = logging.getLogger(__name__)
 # Helpers
 # ---------------------------------------------------------------------------
 
+_IDENT_RE = __import__("re").compile(r"^[A-Za-z_][A-Za-z0-9_]*$")
+
+
+def _assert_ident(ident: str, kind: str = "identifier") -> str:
+    """Guard against SQL injection in dynamically interpolated identifiers.
+
+    All table/column names flow through here before being embedded into f-strings,
+    so attacker-controlled values cannot break out even if they reach this layer.
+    """
+    if not isinstance(ident, str) or not _IDENT_RE.match(ident):
+        raise ValueError(f"Unsafe {kind}: {ident!r}")
+    return ident
+
+
 async def _has_column(conn, table: str, column: str) -> bool:
     """Check if a column exists in a SQLite table."""
+    _assert_ident(table, "table")
     cols = await conn.run_sync(
         lambda sync_conn: [
             row[1]
@@ -1187,3 +1202,15 @@ async def migrate_notification_slot_locale(engine: AsyncEngine) -> None:
                     "Merged system notification template configs for %s (EN=%d, RU=%d) into %d",
                     provider_type, en_id, ru_id, en_id,
                 )
+
+
+async def migrate_user_token_version(engine: AsyncEngine) -> None:
+    """Add token_version column to user for JWT revocation on password change."""
+    async with engine.begin() as conn:
+        if not await _has_table(conn, "user"):
+            return
+        if not await _has_column(conn, "user", "token_version"):
+            await conn.execute(
+                text("ALTER TABLE user ADD COLUMN token_version INTEGER NOT NULL DEFAULT 1")
+            )
+            logger.info("Added token_version column to user table")