LTM 02: Memory Update & Delete

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The memory update and delete stage handles model-initiated modifications or removals of existing persistent memories using the integer identifier shown in prompt context.

Flow and ownership

When the model detects an outdated, inaccurate, or redundant memory, it invokes update_long_term_memory managed by UpdateLongTermMemoryTool in src/tools/functionCalls/updateLongTermMemoryTool.ts.

The tool distinguishes between updates and deletions based on the provided content:

• Update: memory_content provides replacement text. The tool sanitizes braces using sanitizeUnknownTemplatePlaceholders() and validates length via validateMemoryContent().
• Deletion: memory_content is empty or whitespace-only after sanitization.

Scope determination and resolution

Target scope depends on the presence of the target_user argument:

• Server scope: when target_user is absent, the tool updates or deletes records in the server_memories table scoped to (server_id, persona_lineage_id).
• Personal scope: when target_user is provided, resolveUserTarget() (src/utils/discord/targetResolver.ts) matches the display name.
  • Bridge users reject personal updates with an error because bridge users only support server-wide memories.
  • Personal updates targeting the bot itself return an error.
  • The resolved user must belong to the current guild or direct message channel.
  • For updates, if the target user has PrivacyLevel.PARTIAL or PrivacyLevel.FULL, the update halts with a privacy error. Deletions remain permitted.

Database operations and notifications

Following parameter and scope checks, execution routes to the matching repository:

1. Database execution:
   • Server update: serverMemoryRepository.updateByIdWithLineage() updates content in server_memories.
   • Server deletion: serverMemoryRepository.removeByIdWithLineage() removes the row and returns its prior content.
   • Personal update: personalMemoryRepository.updateByIdForUserAndLineage() updates content in personal_memories.
   • Personal deletion: personalMemoryRepository.removeByIdForUserAndLineage() removes the row and returns its prior content. Content-changing updates from either the tool or memory panels delete every embedding family in the same transaction while preserving decay metadata. Model edits leave manually_written unchanged. Every successful edit-form save through /memories or /personal memories sets it to true in the content-update transaction, including channel-only, tag-only, and unchanged-content saves. This protects the memory from automatic eviction while allowing it to become dormant. Unchanged content keeps its vectors. Deleting a memory cascades to its vectors; post-turn fill rebuilds edited content only when it is visible to recall.
2. Cache invalidation:
   • Server operations call invalidateTomoriStateCache(serverDiscId) immediately after successful database execution.
   • Personal operations call invalidateUserCache(targetUserId) immediately after successful database execution.
3. Discord embed confirmation:
   • Updates dispatch an amber notice embed using sendMemoryEmbedWithExpand().
   • Deletions dispatch a red notice embed displaying the deleted memory content for user confirmation.

The tool returns a successful ToolResult detailing the outcome.

Constraints and rationale

• Lineage protection: all repository updates and deletes enforce persona_lineage_id matching, preventing one character persona from mutating or deleting memories belonging to another.
• Accidental deletion transparency: deletion operations fetch the memory text prior to row removal, allowing the confirmation notice to display the exact content that was removed.
• Cache freshness guarantee: cache invalidation occurs immediately after database success, so subsequent context builds reload fresh records directly from the database.

Source pointers

• src/tools/functionCalls/updateLongTermMemoryTool.ts: UpdateLongTermMemoryTool parameter handling, scope routing, and execution flow.
• src/utils/db/repositories/ServerMemoryRepository.ts: queries for updating and removing server memories with lineage checks.
• src/utils/db/repositories/PersonalMemoryRepository.ts: queries for updating and removing personal memories with lineage checks.
• src/utils/cache/tomoriStateCache.ts and src/utils/cache/userCache.ts: cache invalidation functions.