feat: Implement session management and search functionality

- Added SDK session, observation, and summary types to types.ts.
- Refactored worker-service to use SessionStore for session management.
- Created SessionSearch class for FTS5 full-text search and structured queries.
- Implemented SessionStore for CRUD operations on SDK sessions, observations, and summaries.
- Added migrations for database schema updates, including new columns and constraints.
- Enhanced search capabilities with filters for projects, types, concepts, and date ranges.

src/hooks/cleanup.ts

@@ -1,4 +1,4 @@
-import { HooksDatabase } from '../services/sqlite/HooksDatabase.js';
+import { SessionStore } from '../services/sqlite/SessionStore.js';
 
 export interface SessionEndInput {
   session_id: string;
@@ -46,7 +46,7 @@ export async function cleanupHook(input?: SessionEndInput): Promise<void> {
     console.error('[claude-mem cleanup] Searching for active SDK session', { session_id, reason });
 
     // Find active SDK session
-    const db = new HooksDatabase();
+    const db = new SessionStore();
     const session = db.findActiveSDKSession(session_id);
 
     if (!session) {

src/hooks/context.ts

@@ -1,5 +1,5 @@
 import path from 'path';
-import { HooksDatabase } from '../services/sqlite/HooksDatabase.js';
+import { SessionStore } from '../services/sqlite/SessionStore.js';
 
 export interface SessionStartInput {
   session_id?: string;
@@ -20,7 +20,7 @@ export function contextHook(input?: SessionStartInput): void {
   const cwd = input?.cwd ?? process.cwd();
   const project = cwd ? path.basename(cwd) : 'unknown-project';
 
-  const db = new HooksDatabase();
+  const db = new SessionStore();
 
   try {
     const sessions = db.getRecentSessionsWithStatus(project, 3);

src/hooks/new.ts

@@ -1,5 +1,5 @@
 import path from 'path';
-import { HooksDatabase } from '../services/sqlite/HooksDatabase.js';
+import { SessionStore } from '../services/sqlite/SessionStore.js';
 import { createHookResponse } from './hook-response.js';
 
 export interface UserPromptSubmitInput {
@@ -42,7 +42,7 @@ export async function newHook(input?: UserPromptSubmitInput): Promise<void> {
 
   const { session_id, cwd, prompt } = input;
   const project = path.basename(cwd);
-  const db = new HooksDatabase();
+  const db = new SessionStore();
 
   try {
     // Check for any existing session (active, failed, or completed)

src/hooks/save.ts

@@ -1,4 +1,4 @@
-import { HooksDatabase } from '../services/sqlite/HooksDatabase.js';
+import { SessionStore } from '../services/sqlite/SessionStore.js';
 import { createHookResponse } from './hook-response.js';
 import { logger } from '../utils/logger.js';
 
@@ -32,7 +32,7 @@ export async function saveHook(input?: PostToolUseInput): Promise<void> {
     return;
   }
 
-  const db = new HooksDatabase();
+  const db = new SessionStore();
   const session = db.findActiveSDKSession(session_id);
 
   if (!session) {

src/hooks/summary.ts

@@ -1,4 +1,4 @@
-import { HooksDatabase } from '../services/sqlite/HooksDatabase.js';
+import { SessionStore } from '../services/sqlite/SessionStore.js';
 import { createHookResponse } from './hook-response.js';
 import { logger } from '../utils/logger.js';
 
@@ -18,7 +18,7 @@ export async function summaryHook(input?: StopInput): Promise<void> {
   }
 
   const { session_id } = input;
-  const db = new HooksDatabase();
+  const db = new SessionStore();
   const session = db.findActiveSDKSession(session_id);
 
   if (!session) {