Summary

Fixes #17971 - Session rotation on every Discord message (Windows)

Problem

When initSessionState() reads the session store, it uses the cached version by default. The cache is:

• Process-local (each gateway process has its own)
• Invalidated by mtime comparison (which can miss rapid writes or have coarse granularity on Windows)

When multiple gateway processes run simultaneously, or messages arrive in quick succession, one process may read stale cache and not find the session entry → generates new sessionId → creates new transcript file.

Symptoms:

• 134+ orphaned .jsonl transcript files, each with only 1 exchange
• Session rotates even 6-8 seconds apart
• Bot "forgets" context after every message

Solution

Add skipCache: true when loading the session store in initSessionState(). This ensures session identity (sessionId) is always resolved from the latest on-disk state.

Why This Is Safe

1. initSessionState is already on the critical path for every message
2. The disk read is fast (small JSON file)
3. The updateSessionStore call later in the function already uses locking and skipCache: true
4. This matches the behavior of other critical session operations

Testing

• The fix is minimal (1 line + comment)
• Addresses the root cause identified in [Bug]: Group/channel Discord sessions get new sessionId on every incoming message (Windows) #17971
• Performance impact is negligible (JSON read instead of cache lookup)

Compatibility

• Backward compatible: Yes
• No config changes required
• No migration needed

Greptile Summary

Fixes session rotation on every Discord message (particularly on Windows) by adding skipCache: true to the loadSessionStore() call in initSessionState(). The in-memory cache uses mtime-based validation which can miss rapid writes (Windows mtime granularity is ~2 seconds), and each gateway process maintains its own cache — causing stale reads, spurious new sessionId generation, and orphaned transcript files.

• Adds skipCache: true to loadSessionStore() in initSessionState(), ensuring session identity is always resolved from the latest on-disk state
• Aligns with existing patterns: updateSessionStore already uses skipCache: true internally, as do other critical callers like appendAssistantMessageToSessionTranscript and snapshotMainSessionMapping
• Performance impact is negligible — the session store is a small JSON file read once per message

Confidence Score: 5/5

• This PR is safe to merge — it's a minimal, well-targeted fix that aligns with existing patterns in the codebase.
• The change is a single-line addition of skipCache: true to an existing function call, with no behavioral changes other than ensuring fresh disk reads. The pattern is already used by updateSessionStore and other critical callers. The fix directly addresses the root cause of [Bug]: Group/channel Discord sessions get new sessionId on every incoming message (Windows) #17971 (stale cache causing orphaned transcripts). Performance impact is negligible for a small JSON file read once per message.
• No files require special attention.

_{Last reviewed commit: 94cbeb7}

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