feat: tag management

src/main/database/connection.ts

@@ -184,6 +184,18 @@ export class DatabaseConnection {
       CREATE INDEX IF NOT EXISTS idx_post_links_source ON post_links(source_post_id);
       CREATE INDEX IF NOT EXISTS idx_post_links_target ON post_links(target_post_id);
       CREATE UNIQUE INDEX IF NOT EXISTS posts_project_slug_idx ON posts(project_id, slug);
+
+      CREATE TABLE IF NOT EXISTS tags (
+        id TEXT PRIMARY KEY,
+        project_id TEXT NOT NULL,
+        name TEXT NOT NULL,
+        color TEXT,
+        created_at INTEGER NOT NULL,
+        updated_at INTEGER NOT NULL
+      );
+
+      CREATE INDEX IF NOT EXISTS idx_tags_project_id ON tags(project_id);
+      CREATE UNIQUE INDEX IF NOT EXISTS tags_project_name_idx ON tags(project_id, name);
     `);
 
     // Check if project_id column exists in posts table, add if missing (migration)
@@ -368,6 +380,27 @@ export class DatabaseConnection {
       console.log('FTS table migrated - rebuild index required');
     }
 
+    // Migration: Ensure tags table exists (for databases created before tags feature)
+    const tagsTableExists = await this.localClient.execute(
+      "SELECT name FROM sqlite_master WHERE type='table' AND name='tags'"
+    );
+    if (tagsTableExists.rows.length === 0) {
+      console.log('Creating tags table...');
+      await this.localClient.execute(`
+        CREATE TABLE tags (
+          id TEXT PRIMARY KEY,
+          project_id TEXT NOT NULL,
+          name TEXT NOT NULL,
+          color TEXT,
+          created_at INTEGER NOT NULL,
+          updated_at INTEGER NOT NULL
+        )
+      `);
+      await this.localClient.execute('CREATE INDEX idx_tags_project_id ON tags(project_id)');
+      await this.localClient.execute('CREATE UNIQUE INDEX tags_project_name_idx ON tags(project_id, name)');
+      console.log('Tags table created successfully');
+    }
+
     // Create default project if none exists
     const existingProjects = await this.localClient.execute('SELECT COUNT(*) as count FROM projects');
     if (existingProjects.rows[0] && (existingProjects.rows[0].count as number) === 0) {

src/main/database/schema.ts

@@ -95,6 +95,19 @@ export const postLinks = sqliteTable('post_links', {
   createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
 });
 
+// Tags table - stores tag metadata with optional colors
+export const tags = sqliteTable('tags', {
+  id: text('id').primaryKey(),
+  projectId: text('project_id').notNull(),
+  name: text('name').notNull(),
+  color: text('color'), // Optional hex color like #ff0000
+  createdAt: integer('created_at', { mode: 'timestamp' }).notNull(),
+  updatedAt: integer('updated_at', { mode: 'timestamp' }).notNull(),
+}, (table) => ({
+  // Composite unique index: tag name must be unique within each project
+  projectNameIdx: uniqueIndex('tags_project_name_idx').on(table.projectId, table.name),
+}));
+
 // Types for TypeScript
 export type Project = typeof projects.$inferSelect;
 export type NewProject = typeof projects.$inferInsert;
@@ -108,3 +121,5 @@ export type Setting = typeof settings.$inferSelect;
 export type NewSetting = typeof settings.$inferInsert;
 export type PostLink = typeof postLinks.$inferSelect;
 export type NewPostLink = typeof postLinks.$inferInsert;
+export type Tag = typeof tags.$inferSelect;
+export type NewTag = typeof tags.$inferInsert;