Implement fire-and-forget span persistence:
- Add logSpanToDatabase and persistSpanToDatabase to logger
- Persist spans, attributes, events, and event attributes to new tables
- Wire edgeFunctionWrapper to call DB persistence after each span
- Create required tables, views, and security policies
- Ensure non-blocking and guard for missing Supabase creds
Add centralized errorFormatter to convert various error types into readable messages, and apply it across edge functions. Replace String(error) usage with formatEdgeError, update relevant imports, fix a throw to use toError, and enhance logger to log formatted errors. Includes new errorFormatter.ts and widespread updates to 18+ edge functions plus logger integration.
Implement distributed tracing across edge functions:
- Introduce span types and utilities (logger.ts enhancements)
- Replace request tracking with span-based tracing in approval and rejection flows
- Propagate and manage W3C trace context in edge tracking
- Add span visualization scaffolding (spanVisualizer.ts) and admin TraceViewer UI (TraceViewer.tsx)
- Create tracing-related type definitions and support files
- Prepare RPC call logging with span context and retries
