Refactor code structure for improved readability and maintainability; optimize performance across multiple modules.

backend/models/community/push_notification_device.js

@@ -0,0 +1,14 @@
+import { sequelize } from '../../utils/sequelize.js';
+import { DataTypes } from 'sequelize';
+
+export default sequelize.define('push_notification_device', {
+  userId: { type: DataTypes.INTEGER, allowNull: false },
+  token: { type: DataTypes.TEXT, allowNull: false, unique: true },
+  platform: { type: DataTypes.STRING(20), allowNull: false, defaultValue: 'android' },
+  enabled: { type: DataTypes.BOOLEAN, allowNull: false, defaultValue: true },
+}, {
+  tableName: 'push_notification_device',
+  schema: 'community',
+  underscored: true,
+  timestamps: true,
+});

backend/models/community/push_notification_setting.js

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+import { sequelize } from '../../utils/sequelize.js';
+import { DataTypes } from 'sequelize';
+
+export default sequelize.define('push_notification_setting', {
+  userId: { type: DataTypes.INTEGER, primaryKey: true, allowNull: false },
+  enabled: { type: DataTypes.BOOLEAN, allowNull: false, defaultValue: false },
+  chatEnabled: { type: DataTypes.BOOLEAN, allowNull: false, defaultValue: true },
+  friendLoginEnabled: { type: DataTypes.BOOLEAN, allowNull: false, defaultValue: true },
+  falukantEnabled: { type: DataTypes.BOOLEAN, allowNull: false, defaultValue: true },
+  vocabReminderEnabled: { type: DataTypes.BOOLEAN, allowNull: false, defaultValue: true },
+}, {
+  tableName: 'push_notification_setting',
+  schema: 'community',
+  underscored: true,
+  timestamps: true,
+});

backend/models/community/user_block.js

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+import { sequelize } from '../../utils/sequelize.js';
+import { DataTypes } from 'sequelize';
+
+export default sequelize.define('user_block', {
+  blockerId: { type: DataTypes.INTEGER, allowNull: false },
+  blockedId: { type: DataTypes.INTEGER, allowNull: false },
+}, { tableName: 'user_block', schema: 'community', underscored: true, timestamps: true });