created the datebase index optimisation

apps/api-service/.env.example

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+# Database Configuration
+DATABASE_HOST=localhost
+DATABASE_PORT=5432
+DATABASE_USERNAME=postgres
+DATABASE_PASSWORD=postgres
+DATABASE_NAME=gasguard
+DATABASE_SYNCHRONIZE=false
+DATABASE_LOGGING=false
+DATABASE_SSL=false
+DATABASE_MAX_QUERY_TIME=1000
+DATABASE_MAX_CONNECTIONS=10
+DATABASE_MIN_CONNECTIONS=1
+DATABASE_CONNECTION_TIMEOUT=30000
+DATABASE_IDLE_TIMEOUT=10000
+
+# Application Configuration
+PORT=3000
+NODE_ENV=development
+
+# Analytics Configuration
+ANALYTICS_ENABLED=true
+ANALYTICS_RETENTION_DAYS=90

apps/api-service/ormconfig.ts

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+import { DataSource } from 'typeorm';
+
+export default new DataSource({
+  type: 'postgres',
+  host: process.env.DATABASE_HOST || 'localhost',
+  port: parseInt(process.env.DATABASE_PORT || '5432', 10),
+  username: process.env.DATABASE_USERNAME || 'postgres',
+  password: process.env.DATABASE_PASSWORD || 'postgres',
+  database: process.env.DATABASE_NAME || 'gasguard',
+  synchronize: false,
+  logging: process.env.DATABASE_LOGGING === 'true',
+  entities: ['src/database/entities/**/*.entity{.ts,.js}'],
+  migrations: ['src/database/migrations/**/*{.ts,.js}'],
+  subscribers: ['src/database/subscribers/**/*{.ts,.js}'],
+});