feat(database): add migrations.ts with migration framework

backend/src/database/migrations.ts

@@ -0,0 +1,48 @@
+import { readFileSync } from 'fs';
+import { join } from 'path';
+
+export type Migration = {
+  version: number;
+  name: string;
+  up: string;  // SQL script for migration
+};
+
+export class MigrationManager {
+  private migrations: Migration[] = [];
+  
+  constructor() {
+    this.loadMigrations();
+  }
+  
+  private loadMigrations() {
+    // In a real implementation, this would load migration files from a directory
+    // For now, we'll just create a single migration for the initial schema
+    
+    const schemaPath = join(__dirname, 'schema.sql');
+    const schemaSql = readFileSync(schemaPath, 'utf8');
+    
+    const initialMigration: Migration = {
+      version: 1,
+      name: 'initial_schema',
+      up: schemaSql
+    };
+    
+    this.migrations.push(initialMigration);
+  }
+  
+  public getMigrations(): Migration[] {
+    return this.migrations;
+  }
+  
+  public getMigrationByVersion(version: number): Migration | undefined {
+    return this.migrations.find(m => m.version === version);
+  }
+  
+  public getLatestVersion(): number {
+    if (this.migrations.length === 0) return 0;
+    return Math.max(...this.migrations.map(m => m.version));
+  }
+}
+
+// Export a singleton instance
+export const migrationManager = new MigrationManager();