replace python django backend with nodejs backend

backend/src/knex.ts

@@ -0,0 +1,59 @@
+import knex, {type Knex} from 'knex';
+import {Model} from 'objection';
+import type {ConfigType} from './config/confighelper';
+import {type Migration, Migrations} from './migrations/_migrations';
+
+export async function initDb(config: ConfigType, enableForeignKeys: boolean): Promise<Knex> {
+  const dbConf = (config.database as any)[config.database.use];
+  if (!dbConf) {
+    throw new Error('No database config found with name "' + config.database.use + '"!');
+  }
+
+  if (dbConf.client === 'sqlite3') {
+    if (!dbConf.pool) {
+      dbConf.pool = {};
+    }
+
+    if (enableForeignKeys) {
+      dbConf.pool.afterCreate = (conn: any, cb: any) => {
+        conn.run('PRAGMA foreign_keys = ON', cb);
+      };
+    }
+  }
+
+  const knx = knex(dbConf);
+  Model.knex(knx);
+  return knx;
+}
+
+export async function migrateDb(knex: Knex): Promise<boolean> {
+  try {
+    await knex.migrate.latest({
+      migrationSource: new ViteMigrationSource(Migrations),
+    });
+    return true;
+  } catch (e) {
+    console.log(e);
+    return false;
+  }
+}
+
+class ViteMigrationSource implements Knex.MigrationSource<Migration> {
+  private readonly migrations: Migration[];
+
+  constructor(migrations: Migration[]) {
+    this.migrations = migrations;
+  }
+
+  getMigrations(loadExtensions: string[]): Promise<Migration[]> {
+    return Promise.resolve(this.migrations);
+  }
+
+  getMigrationName(migration: Migration): string {
+    return migration.name;
+  }
+
+  getMigration(migration: Migration): Promise<Knex.Migration> {
+    return Promise.resolve(migration.migration);
+  }
+}