feat: licenses administration basic authentication.

feat: accounts slug.
feat: duplicate accounts_balance table and merge balance with accounts table.
feat: refactoring customers and vendors.
feat: system user soft deleting.
feat: preventing build tenant database without any subscription.
feat: remove 'password' property from 'req.user' object.
feat: refactoring JournalPoster class.
feat: delete duplicated directories and files.

server/src/repositories/AccountRepository.ts

@@ -0,0 +1,55 @@
+import TenantRepository from '@/repositories/TenantRepository';
+
+export default class AccountRepository extends TenantRepository {
+  models: any;
+  repositories: any;
+  cache: any;
+
+  /**
+   * Constructor method.
+   * @param {number} tenantId - The given tenant id.
+   */
+  constructor(
+    tenantId: number,
+  ) {
+    super(tenantId);
+
+    this.models = this.tenancy.models(tenantId);
+    this.cache = this.tenancy.cache(tenantId);
+  }
+
+  /**
+   * Retrieve accounts dependency graph.
+   * @returns {}
+   */
+  async getDependencyGraph() {
+    const { Account } = this.models;
+    const accounts = await this.allAccounts();
+
+    return this.cache.get('accounts.depGraph', async () => {
+      return Account.toDependencyGraph(accounts);
+    });
+  }
+
+  /**
+   * Retrieve all accounts on the storage.
+   * @return {}
+   */
+  async allAccounts() {
+    const { Account } = this.models;
+    return this.cache.get('accounts', async () => {
+      return Account.query();
+    });
+  }
+
+  /**
+   * Retrieve account of the given account slug.
+   * @param {string} slug 
+   */
+  async getBySlug(slug: string) {
+    const { Account } = this.models;
+    return this.cache.get(`accounts.slug.${slug}`, () => {
+      return Account.query().findOne('slug', slug);
+    });
+  }
+}