feat: database

migrations/runner.js

@@ -0,0 +1,104 @@
+const { QueryInterface } = require('sequelize');
+const fs = require('fs').promises;
+const path = require('path');
+
+/**
+ * Simple migration runner for Sequelize
+ * Checks which migrations have been run and executes pending ones
+ */
+class MigrationRunner {
+  constructor(sequelize) {
+    this.sequelize = sequelize;
+    this.migrationsPath = path.join(__dirname);
+  }
+
+  async ensureMigrationsTable() {
+    const queryInterface = this.sequelize.getQueryInterface();
+    
+    // Check if migrations table exists
+    const [results] = await this.sequelize.query(`
+      SELECT EXISTS (
+        SELECT FROM information_schema.tables 
+        WHERE table_schema = 'public' 
+        AND table_name = 'SequelizeMeta'
+      );
+    `);
+
+    if (!results[0].exists) {
+      // Create migrations table
+      await queryInterface.createTable('SequelizeMeta', {
+        name: {
+          type: require('sequelize').DataTypes.STRING,
+          allowNull: false,
+          primaryKey: true
+        }
+      });
+    }
+  }
+
+  async getExecutedMigrations() {
+    await this.ensureMigrationsTable();
+    
+    const [results] = await this.sequelize.query(
+      'SELECT name FROM "SequelizeMeta" ORDER BY name'
+    );
+    
+    return results.map(row => row.name);
+  }
+
+  async getAllMigrations() {
+    const files = await fs.readdir(this.migrationsPath);
+    return files
+      .filter(file => file.endsWith('.js') && file !== 'runner.js')
+      .sort();
+  }
+
+  async runMigrations() {
+    const executed = await this.getExecutedMigrations();
+    const allMigrations = await this.getAllMigrations();
+    const pending = allMigrations.filter(m => !executed.includes(m));
+
+    if (pending.length === 0) {
+      console.log('No pending migrations');
+      return;
+    }
+
+    console.log(`Running ${pending.length} pending migration(s)...`);
+
+    for (const migrationFile of pending) {
+      const migration = require(path.join(this.migrationsPath, migrationFile));
+      
+      if (!migration.up || typeof migration.up !== 'function') {
+        throw new Error(`Migration ${migrationFile} does not export an 'up' function`);
+      }
+
+      const queryInterface = this.sequelize.getQueryInterface();
+      const transaction = await this.sequelize.transaction();
+
+      try {
+        console.log(`Running migration: ${migrationFile}`);
+        await migration.up(queryInterface, this.sequelize.constructor);
+        
+        // Record migration as executed
+        await this.sequelize.query(
+          `INSERT INTO "SequelizeMeta" (name) VALUES (:name)`,
+          {
+            replacements: { name: migrationFile },
+            transaction
+          }
+        );
+
+        await transaction.commit();
+        console.log(`Completed migration: ${migrationFile}`);
+      } catch (error) {
+        await transaction.rollback();
+        throw new Error(`Migration ${migrationFile} failed: ${error.message}`);
+      }
+    }
+
+    console.log('All migrations completed successfully');
+  }
+}
+
+module.exports = MigrationRunner;
+