refactor: make getCountryCode a static db core function

backend/database/core.ts

@@ -29,7 +29,7 @@ import { ColumnDiff, FieldValueMap, GetQueryBuilderOptions } from './types';
  *
  * 1. Init core: `const db = new DatabaseCore(dbPath)`.
  * 2. Connect db: `db.connect()`. This will allow for raw queries to be executed.
- * 3. Set schemas: `bb.setSchemaMap(schemaMap)`. This will allow for ORM functions to be executed.
+ * 3. Set schemas: `db.setSchemaMap(schemaMap)`. This will allow for ORM functions to be executed.
  * 4. Migrate: `await db.migrate()`. This will create absent tables and update the tables' shape.
  * 5. ORM function execution: `db.get(...)`, `db.insert(...)`, etc.
  * 6. Close connection: `await db.close()`.
@@ -65,6 +65,29 @@ export default class DatabaseCore extends DatabaseBase {
     };
   }
 
+  static async getCountryCode(dbPath: string): Promise<string> {
+    let countryCode = 'in';
+    const db = new DatabaseCore(dbPath);
+    db.connect();
+
+    let query: { countryCode: string }[] = [];
+    try {
+      query = await db.knex!('SingleValue').where({
+        fieldname: 'countryCode',
+        parent: 'SystemSettings',
+      });
+    } catch {
+      // Database not inialized and no countryCode passed
+    }
+
+    if (query.length > 0) {
+      countryCode = query[0].countryCode as string;
+    }
+
+    await db.close();
+    return countryCode;
+  }
+
   setSchemaMap(schemaMap: SchemaMap) {
     this.schemaMap = schemaMap;
   }

backend/database/manager.ts

@@ -25,10 +25,11 @@ export class DatabaseManager extends DatabaseDemuxBase {
   }
 
   async connectToDatabase(dbPath: string, countryCode?: string) {
+    countryCode ??= await DatabaseCore.getCountryCode(dbPath);
+
     this.db = new DatabaseCore(dbPath);
     this.db.connect();
 
-    countryCode ??= await this.#getCountryCode();
     const schemaMap = getSchemas(countryCode);
     this.db.setSchemaMap(schemaMap);
 
@@ -102,28 +103,6 @@ export class DatabaseManager extends DatabaseDemuxBase {
     return patches.filter((p) => !executedPatches.includes(p.name));
   }
 
-  async #getCountryCode(): Promise<string | undefined> {
-    if (this.db === undefined) {
-      return undefined;
-    }
-
-    let query: { countryCode: string }[] = [];
-    try {
-      query = await this.db.knex!('SingleValue').where({
-        fieldname: 'countryCode',
-        parent: 'SystemSettings',
-      });
-    } catch {
-      // Database not inialized and no countryCode passed
-    }
-
-    if (query.length > 0) {
-      return query[0].countryCode as string;
-    }
-
-    return undefined;
-  }
-
   async #unlinkIfExists(dbPath: string) {
     try {
       fs.unlink(dbPath);