Optimized Reference Versions

These files contain the optimized reference versions of the sendMessage handlers. There are only two comparison points:

• Raw: the AI-generated baseline
• Optimized: the one-pass improved implementation

What changed (STDB)

Same features as AI-generated. Implementation changes only:

• Membership check: use userIdentity.filter(ctx.sender) instead of roomId.filter(roomId) + [...spread] + toHexString() string allocation
• Read receipt update: same fix (identity index, no spread, no string alloc)
• Typing indicator cleanup: same fix
• User existence check: kept
• Room existence check: kept
• Message insert: kept
• All validation: kept

What changed (PG 20260406)

Same features as AI-generated. Implementation changes only:

• Rate limit: kept
• Banned check: kept
• Membership check: kept
• Message insert: kept (blocking await, need the result)
• Room emit: kept
• lastSeen update: made non-blocking (fire without await)
• Notification fanout query + loop: made non-blocking (fire without await)
• Thread reply counting: kept
• Typing indicator cleanup: kept
• Activity tracking: kept

What changed (PG 20260403)

Same features as AI-generated. Implementation changes only:

• Message insert: kept (blocking await)
• User lookup for username: made non-blocking (fire without await, emit after lookup resolves)
• Room activity broadcast: kept
• Response sent immediately after insert instead of after user lookup

Benchmark results (averaged across 2 runs)

Version	STDB avg	PG avg	Ratio
Raw	5,267 msgs/sec	694 msgs/sec	7.6x
Optimized (this dir)	25,278 msgs/sec	1,139 msgs/sec	22x