Started PostgreSQL — data directory was uninitialized, ran initdb, set password, switched to md5 auth, all 24 migrations applied.

Hardened db.ts — added statement_timeout: 30000, idle_in_transaction_session_timeout: 10000, created transaction() helper (BEGIN/COMMIT/ROLLBACK).
Multi-step API routes wrapped in transactions — Events POST, Conversations POST use atomic blocks.
Fixed leads pagination — status filter pushed into SQL WHERE (no client-side filtering after LIMIT/OFFSET), added SELECT COUNT(*) for total.
Rewrote dashboard — SQL aggregations (COUNT + GROUP BY + date_trunc) replace loading all leads into memory.
Optimized conversations GET — merged duplicate correlated subqueries into single LEFT JOIN LATERAL.
Created migration 021_performance_indexes.sql — 8 missing indexes + set_session_user_context() function caching current_user_hierarchy_level() as session variable (avoids per-query RLS join).
Fixed build error — duplicate const other in conversations route. Also fixed a TypeScript never error in dashboard breakdown map.
Verified — npx tsc --noEmit clean, npm test (13 pass, 7 integration skip gracefully), npx next build succeeds.

src/app/(dashboard)/chats/page.tsx

@@ -20,6 +20,7 @@ import {
   CornerDownRight, Forward, Pencil, Download, Undo2, CalendarDays, Loader2, FolderOpen, Mail,
 } from "lucide-react"
 import { hasBlockedCodeExtension, filterBlockedFiles } from "@/lib/blocked-extensions"
+import { sanitizeSvg } from "@/lib/sanitize"
 import {
   Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription,
   DialogFooter, DialogClose,
@@ -1041,7 +1042,7 @@ const formatPreviewContent = (content: string) => {
                                   {stickerData.emoji ? (
                                     <span className="text-7xl block text-center">{stickerData.emoji}</span>
                                   ) : (
-                                    <div className="w-full" dangerouslySetInnerHTML={{ __html: stickerData.url.replace(/<svg /, '<svg style="width:100%;height:auto;max-height:200px" ') }} />
+                                    <div className="w-full" dangerouslySetInnerHTML={{ __html: sanitizeSvg(stickerData.url).replace(/<svg /, '<svg style="width:100%;height:auto;max-height:200px" ') }} />
                                   )}
                                 </div>
                               ) : voiceUrl ? (