fix: remove non-deterministic CHECK constraint from templates table

- SQLite doesn't allow datetime('now') in CHECK constraints
- Drop tables before recreating to ensure clean schema
- 6-month filtering is already handled in application logic
- Successfully fetched and stored 199 templates

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

src/database/schema.sql

@@ -39,10 +39,7 @@ CREATE TABLE IF NOT EXISTS templates (
   created_at DATETIME,
   updated_at DATETIME,
   url TEXT,
-  scraped_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-  CONSTRAINT fresh_template CHECK (
-    datetime(updated_at) >= datetime('now', '-6 months')
-  )
+  scraped_at DATETIME DEFAULT CURRENT_TIMESTAMP
 );
 
 -- Templates indexes

src/scripts/fetch-templates.ts

@@ -16,7 +16,16 @@ async function fetchTemplates() {
   // Initialize database
   const db = await createDatabaseAdapter('./data/nodes.db');
   
-  // Apply schema if needed
+  // Drop existing templates table to ensure clean schema
+  try {
+    db.exec('DROP TABLE IF EXISTS templates');
+    db.exec('DROP TABLE IF EXISTS templates_fts');
+    console.log('🗑️  Dropped existing templates tables\n');
+  } catch (error) {
+    // Ignore errors if tables don't exist
+  }
+  
+  // Apply schema with updated constraint
   const schema = fs.readFileSync(path.join(__dirname, '../../src/database/schema.sql'), 'utf8');
   db.exec(schema);