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src/db/store.js

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+import sql from 'mssql';
+import LibDashStore from 'libdashstore';
+import env from '../config/env.js';
+
+let pool;
+let store;
+let connecting;
+
+function getMssqlConfig() {
+    const { server, database, user, password, port, encrypt, trustServerCertificate } = env.mssql;
+
+    if (!server || !database || !user || !password) {
+        throw new Error('MSSQL is not configured (MSSQL_SERVER, MSSQL_DATABASE, MSSQL_USER, MSSQL_PASSWORD required)');
+    }
+
+    return {
+        server,
+        database,
+        user,
+        password,
+        port,
+        pool: {
+            max: 10,
+            min: 0,
+            idleTimeoutMillis: 30_000,
+        },
+        options: {
+            encrypt,
+            trustServerCertificate,
+        },
+    };
+}
+
+/**
+ * Returns the initialized LibDashStore singleton.
+ * @returns {Promise<InstanceType<typeof LibDashStore>>}
+ */
+export async function getStore() {
+    if (store) {
+        return store;
+    }
+
+    if (!connecting) {
+        connecting = (async () => {
+            pool = await new sql.ConnectionPool(getMssqlConfig()).connect();
+            store = await new LibDashStore(pool);
+            return store;
+        })().finally(() => {
+            connecting = undefined;
+        });
+    }
+
+    return connecting;
+}
+
+export async function ensureConnection() {
+    await getStore();
+}
+
+export async function closeStore() {
+    if (pool) {
+        await pool.close();
+        pool = undefined;
+        store = undefined;
+    }
+}