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feat(CF-1314): Content hashing to prevent duplicate embeddings

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SHA-256 hash check before embedding API call eliminates ~60-80% of
redundant embedding requests. Consolidates dual INSERT paths to single
INSERT with nullable embedding column.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Christian Gick
2026-02-18 08:28:11 +02:00
parent 77097ac65f
commit 1f499bd926
6 changed files with 127 additions and 81 deletions
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36
src/tools/session-docs.ts
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@@ -2,7 +2,7 @@
// Replaces file-based CLAUDE.md and plan files with database storage
import { query, queryOne, execute } from '../db.js';
import { getEmbedding, formatEmbedding } from '../embeddings.js';
import { getEmbedding, formatEmbedding, generateContentHash } from '../embeddings.js';
import { getSessionId } from './session-id.js';
// ============================================================================
@@ -36,14 +36,25 @@ export async function sessionNoteAdd(args: SessionNoteAddArgs): Promise<string>
const { session_id: providedSessionId, note_type, content } = args;
const session_id = providedSessionId || getSessionId();
// CF-1314: Hash content for dedup before embedding API call
const contentHash = generateContentHash(content);
const existing = await queryOne<{ id: number }>(
'SELECT id FROM session_notes WHERE content_hash = $1 AND session_id = $2 LIMIT 1',
[contentHash, session_id]
);
if (existing) {
return `Note already exists (id: ${existing.id}) in session ${session_id}`;
}
// Generate embedding for semantic search
const embedding = await getEmbedding(content);
const embeddingFormatted = embedding ? formatEmbedding(embedding) : null;
await execute(
`INSERT INTO session_notes (session_id, note_type, content, embedding)
VALUES ($1, $2, $3, $4)`,
[session_id, note_type, content, embeddingFormatted]
`INSERT INTO session_notes (session_id, note_type, content, embedding, content_hash)
VALUES ($1, $2, $3, $4, $5)`,
[session_id, note_type, content, embeddingFormatted, contentHash]
);
return `Note added to session ${session_id} (type: ${note_type})`;
@@ -113,15 +124,26 @@ interface SessionPlan {
export async function sessionPlanSave(args: SessionPlanSaveArgs): Promise<string> {
const { session_id, plan_content, plan_file_name, status = 'draft' } = args;
// CF-1314: Hash content for dedup before embedding API call
const contentHash = generateContentHash(plan_content);
const existing = await queryOne<{ id: number }>(
'SELECT id FROM session_plans WHERE content_hash = $1 AND session_id = $2 LIMIT 1',
[contentHash, session_id]
);
if (existing) {
return `Plan already exists (id: ${existing.id}) in session ${session_id}`;
}
// Generate embedding for semantic search
const embedding = await getEmbedding(plan_content);
const embeddingFormatted = embedding ? formatEmbedding(embedding) : null;
const result = await queryOne<{ id: number }>(
`INSERT INTO session_plans (session_id, plan_file_name, plan_content, status, embedding)
VALUES ($1, $2, $3, $4, $5)
`INSERT INTO session_plans (session_id, plan_file_name, plan_content, status, embedding, content_hash)
VALUES ($1, $2, $3, $4, $5, $6)
RETURNING id`,
[session_id, plan_file_name || null, plan_content, status, embeddingFormatted]
[session_id, plan_file_name || null, plan_content, status, embeddingFormatted, contentHash]
);
const planId = result?.id || 0;