Add PowerClamp module with controller and service for energy data retrieval

libs/common/src/helper/services/sql-loader.service.ts

@@ -0,0 +1,28 @@
+import { SQL_QUERIES_PATH } from '@app/common/constants/sql-query-path';
+import { Injectable, Logger } from '@nestjs/common';
+import { readFileSync } from 'fs';
+import { join } from 'path';
+
+@Injectable()
+export class SqlLoaderService {
+  private readonly logger = new Logger(SqlLoaderService.name);
+  private readonly sqlRootPath = join(__dirname, '../sql/queries');
+
+  loadQuery(module: string, queryName: string): string {
+    const filePath = join(
+      process.cwd(),
+      SQL_QUERIES_PATH,
+      module,
+      `${queryName}.sql`,
+    );
+    try {
+      return readFileSync(filePath, 'utf8');
+    } catch (error) {
+      this.logger.error(
+        `Failed to load SQL query: ${module}/${queryName}`,
+        error.stack,
+      );
+      throw new Error(`SQL query not found: ${module}/${queryName}`);
+    }
+  }
+}