chore: remove obsolete Android app configuration files

- Deleted build.gradle.kts, gradle.properties, and gradlew files as part of the cleanup process.
- Removed local.properties and various generated files from the .gradle directory to streamline the project structure.
- Cleared out unnecessary build artifacts and intermediate files to improve project maintainability.

backend/models/BillingDocument.js

@@ -0,0 +1,47 @@
+import { DataTypes } from 'sequelize';
+import sequelize from '../database.js';
+
+const BillingDocument = sequelize.define('BillingDocument', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true,
+    allowNull: false
+  },
+  runId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'run_id'
+  },
+  displayName: {
+    type: DataTypes.STRING(255),
+    allowNull: false,
+    field: 'display_name'
+  },
+  status: {
+    type: DataTypes.ENUM('draft', 'generated', 'error'),
+    allowNull: false,
+    defaultValue: 'draft'
+  },
+  pdfStoragePath: {
+    type: DataTypes.STRING(1000),
+    allowNull: true,
+    field: 'pdf_storage_path'
+  },
+  pdfFilename: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    field: 'pdf_filename'
+  },
+  errorMessage: {
+    type: DataTypes.TEXT,
+    allowNull: true,
+    field: 'error_message'
+  }
+}, {
+  tableName: 'billing_document',
+  underscored: true,
+  timestamps: true
+});
+
+export default BillingDocument;

backend/models/BillingDocumentValue.js

@@ -0,0 +1,37 @@
+import { DataTypes } from 'sequelize';
+import sequelize from '../database.js';
+
+const BillingDocumentValue = sequelize.define('BillingDocumentValue', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true,
+    allowNull: false
+  },
+  billingDocumentId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'billing_document_id'
+  },
+  fieldKey: {
+    type: DataTypes.STRING(120),
+    allowNull: false,
+    field: 'field_key'
+  },
+  resolvedValue: {
+    type: DataTypes.TEXT,
+    allowNull: true,
+    field: 'resolved_value'
+  },
+  resolvedSource: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    field: 'resolved_source'
+  }
+}, {
+  tableName: 'billing_document_value',
+  underscored: true,
+  timestamps: false
+});
+
+export default BillingDocumentValue;

backend/models/BillingRun.js

@@ -0,0 +1,133 @@
+import { DataTypes } from 'sequelize';
+import sequelize from '../database.js';
+
+const BillingRun = sequelize.define('BillingRun', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true,
+    allowNull: false
+  },
+  clubId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'club_id'
+  },
+  templateId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'template_id'
+  },
+  name: {
+    type: DataTypes.STRING(255),
+    allowNull: false
+  },
+  periodStart: {
+    type: DataTypes.DATEONLY,
+    allowNull: false,
+    field: 'period_start'
+  },
+  periodEnd: {
+    type: DataTypes.DATEONLY,
+    allowNull: false,
+    field: 'period_end'
+  },
+  selfRecipientUserId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'self_recipient_user_id'
+  },
+  selfRecipientName: {
+    type: DataTypes.STRING(255),
+    allowNull: false,
+    field: 'self_recipient_name'
+  },
+  hourlyRate: {
+    type: DataTypes.DECIMAL(10, 2),
+    allowNull: false,
+    field: 'hourly_rate'
+  },
+  computedHoursTotal: {
+    type: DataTypes.DECIMAL(10, 2),
+    allowNull: false,
+    defaultValue: 0,
+    field: 'computed_hours_total'
+  },
+  iban: {
+    type: DataTypes.STRING(64),
+    allowNull: true
+  },
+  ibanWithoutCountry: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'iban_without_country'
+  },
+  sessionLabel: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    field: 'session_label'
+  },
+  sameAccountCheckbox: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'same_account_checkbox'
+  },
+  omitSelfRecipientName: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'omit_self_recipient_name'
+  },
+  omitIban: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'omit_iban'
+  },
+  omitLocationText: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'omit_location_text'
+  },
+  omitDocumentDate: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'omit_document_date'
+  },
+  omitSessionLabel: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'omit_session_label'
+  },
+  locationText: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    field: 'location_text'
+  },
+  documentDate: {
+    type: DataTypes.DATEONLY,
+    allowNull: true,
+    field: 'document_date'
+  },
+  status: {
+    type: DataTypes.ENUM('draft', 'generated', 'finalized', 'cancelled'),
+    allowNull: false,
+    defaultValue: 'draft'
+  },
+  createdByUserId: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    field: 'created_by_user_id'
+  }
+}, {
+  tableName: 'billing_run',
+  underscored: true,
+  timestamps: true
+});
+
+export default BillingRun;

backend/models/BillingTemplate.js

@@ -0,0 +1,62 @@
+import { DataTypes } from 'sequelize';
+import sequelize from '../database.js';
+
+const BillingTemplate = sequelize.define('BillingTemplate', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true,
+    allowNull: false
+  },
+  clubId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'club_id'
+  },
+  name: {
+    type: DataTypes.STRING(255),
+    allowNull: false
+  },
+  description: {
+    type: DataTypes.TEXT,
+    allowNull: true
+  },
+  pdfStoragePath: {
+    type: DataTypes.STRING(1000),
+    allowNull: false,
+    field: 'pdf_storage_path'
+  },
+  pdfFilename: {
+    type: DataTypes.STRING(255),
+    allowNull: false,
+    field: 'pdf_filename'
+  },
+  pdfMimeType: {
+    type: DataTypes.STRING(100),
+    allowNull: false,
+    defaultValue: 'application/pdf',
+    field: 'pdf_mime_type'
+  },
+  isActive: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: true,
+    field: 'is_active'
+  },
+  version: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    defaultValue: 1
+  },
+  createdByUserId: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    field: 'created_by_user_id'
+  }
+}, {
+  tableName: 'billing_template',
+  underscored: true,
+  timestamps: true
+});
+
+export default BillingTemplate;

backend/models/BillingTemplateField.js

@@ -0,0 +1,125 @@
+import { DataTypes } from 'sequelize';
+import sequelize from '../database.js';
+
+const BillingTemplateField = sequelize.define('BillingTemplateField', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true,
+    allowNull: false
+  },
+  templateId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'template_id'
+  },
+  fieldKey: {
+    type: DataTypes.STRING(120),
+    allowNull: false,
+    field: 'field_key'
+  },
+  label: {
+    type: DataTypes.STRING(255),
+    allowNull: false
+  },
+  fieldType: {
+    type: DataTypes.ENUM('text', 'number', 'currency', 'date', 'checkbox', 'formula', 'table_row'),
+    allowNull: false,
+    field: 'field_type'
+  },
+  sourceType: {
+    type: DataTypes.ENUM('manual', 'member', 'trainer', 'club', 'system', 'constant', 'formula'),
+    allowNull: false,
+    defaultValue: 'manual',
+    field: 'source_type'
+  },
+  sourcePath: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    field: 'source_path'
+  },
+  constantValue: {
+    type: DataTypes.STRING(500),
+    allowNull: true,
+    field: 'constant_value'
+  },
+  formatter: {
+    type: DataTypes.ENUM('none', 'iban_no_country', 'date_dd_mm_yyyy', 'currency_eur_2'),
+    allowNull: false,
+    defaultValue: 'none'
+  },
+  isRequired: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'is_required'
+  },
+  mappingMode: {
+    type: DataTypes.ENUM('acroform', 'overlay'),
+    allowNull: false,
+    defaultValue: 'overlay',
+    field: 'mapping_mode'
+  },
+  acroformFieldName: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    field: 'acroform_field_name'
+  },
+  pageNumber: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    field: 'page_number'
+  },
+  x: {
+    type: DataTypes.DECIMAL(10, 2),
+    allowNull: true
+  },
+  y: {
+    type: DataTypes.DECIMAL(10, 2),
+    allowNull: true
+  },
+  width: {
+    type: DataTypes.DECIMAL(10, 2),
+    allowNull: true
+  },
+  height: {
+    type: DataTypes.DECIMAL(10, 2),
+    allowNull: true
+  },
+  fontSize: {
+    type: DataTypes.DECIMAL(5, 2),
+    allowNull: true,
+    field: 'font_size'
+  },
+  align: {
+    type: DataTypes.ENUM('left', 'center', 'right'),
+    allowNull: true
+  },
+  formulaExpression: {
+    type: DataTypes.STRING(1000),
+    allowNull: true,
+    field: 'formula_expression'
+  },
+  tableGroup: {
+    type: DataTypes.STRING(100),
+    allowNull: true,
+    field: 'table_group'
+  },
+  rowIndex: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    field: 'row_index'
+  },
+  sortOrder: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    defaultValue: 0,
+    field: 'sort_order'
+  }
+}, {
+  tableName: 'billing_template_field',
+  underscored: true,
+  timestamps: true
+});
+
+export default BillingTemplateField;

backend/models/BillingUserSetting.js

@@ -0,0 +1,43 @@
+import { DataTypes } from 'sequelize';
+import sequelize from '../database.js';
+
+const BillingUserSetting = sequelize.define('BillingUserSetting', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true,
+    allowNull: false
+  },
+  clubId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'club_id'
+  },
+  userId: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    field: 'user_id'
+  },
+  lastHourlyRate: {
+    type: DataTypes.DECIMAL(10, 2),
+    allowNull: false,
+    defaultValue: 0,
+    field: 'last_hourly_rate'
+  },
+  lastSelfRecipientName: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    field: 'last_self_recipient_name'
+  },
+  lastLocationText: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    field: 'last_location_text'
+  }
+}, {
+  tableName: 'billing_user_setting',
+  underscored: true,
+  timestamps: true
+});
+
+export default BillingUserSetting;

backend/models/index.js

@@ -58,6 +58,12 @@ import TrainingGroup from './TrainingGroup.js';
 import MemberTrainingGroup from './MemberTrainingGroup.js';
 import ClubDisabledPresetGroup from './ClubDisabledPresetGroup.js';
 import TrainingTime from './TrainingTime.js';
+import BillingTemplate from './BillingTemplate.js';
+import BillingTemplateField from './BillingTemplateField.js';
+import BillingRun from './BillingRun.js';
+import BillingDocument from './BillingDocument.js';
+import BillingDocumentValue from './BillingDocumentValue.js';
+import BillingUserSetting from './BillingUserSetting.js';
 // Official tournaments relations
 OfficialTournament.hasMany(OfficialCompetition, { foreignKey: 'tournamentId', as: 'competitions' });
 OfficialCompetition.belongsTo(OfficialTournament, { foreignKey: 'tournamentId', as: 'tournament' });
@@ -399,6 +405,24 @@ ClubDisabledPresetGroup.belongsTo(Club, { foreignKey: 'clubId', as: 'club' });
 TrainingGroup.hasMany(TrainingTime, { foreignKey: 'trainingGroupId', as: 'trainingTimes' });
 TrainingTime.belongsTo(TrainingGroup, { foreignKey: 'trainingGroupId', as: 'trainingGroup' });
 
+// Billing
+Club.hasMany(BillingTemplate, { foreignKey: 'clubId', as: 'billingTemplates' });
+BillingTemplate.belongsTo(Club, { foreignKey: 'clubId', as: 'club' });
+BillingTemplate.hasMany(BillingTemplateField, { foreignKey: 'templateId', as: 'fields' });
+BillingTemplateField.belongsTo(BillingTemplate, { foreignKey: 'templateId', as: 'template' });
+Club.hasMany(BillingRun, { foreignKey: 'clubId', as: 'billingRuns' });
+BillingRun.belongsTo(Club, { foreignKey: 'clubId', as: 'club' });
+BillingTemplate.hasMany(BillingRun, { foreignKey: 'templateId', as: 'runs' });
+BillingRun.belongsTo(BillingTemplate, { foreignKey: 'templateId', as: 'template' });
+BillingRun.hasMany(BillingDocument, { foreignKey: 'runId', as: 'documents' });
+BillingDocument.belongsTo(BillingRun, { foreignKey: 'runId', as: 'run' });
+BillingDocument.hasMany(BillingDocumentValue, { foreignKey: 'billingDocumentId', as: 'values' });
+BillingDocumentValue.belongsTo(BillingDocument, { foreignKey: 'billingDocumentId', as: 'document' });
+Club.hasMany(BillingUserSetting, { foreignKey: 'clubId', as: 'billingUserSettings' });
+BillingUserSetting.belongsTo(Club, { foreignKey: 'clubId', as: 'club' });
+User.hasMany(BillingUserSetting, { foreignKey: 'userId', as: 'billingUserSettings' });
+BillingUserSetting.belongsTo(User, { foreignKey: 'userId', as: 'user' });
+
 export {
     User,
     Log,
@@ -457,4 +481,10 @@ export {
     MemberTrainingGroup,
     ClubDisabledPresetGroup,
     TrainingTime,
+    BillingTemplate,
+    BillingTemplateField,
+    BillingRun,
+    BillingDocument,
+    BillingDocumentValue,
+    BillingUserSetting,
 };