feat: Implement multi-tenancy with dynamic data source routing and introduce a database management UI.

backend/src/main/java/com/magistr/app/config/tenant/TenantConfig.java

@@ -0,0 +1,41 @@
+package com.magistr.app.config.tenant;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+/**
+ * Модель конфигурации тенанта (университета).
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class TenantConfig {
+
+    private String name;      // "ЮЗГУ", "МГУ"
+    private String domain;    // "swsu", "mgu" (поддомен)
+    private String url;       // "jdbc:postgresql://192.168.1.50:5432/magistr_db"
+    private String username;
+    private String password;
+
+    public TenantConfig() {}
+
+    public TenantConfig(String name, String domain, String url, String username, String password) {
+        this.name = name;
+        this.domain = domain;
+        this.url = url;
+        this.username = username;
+        this.password = password;
+    }
+
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+
+    public String getDomain() { return domain; }
+    public void setDomain(String domain) { this.domain = domain; }
+
+    public String getUrl() { return url; }
+    public void setUrl(String url) { this.url = url; }
+
+    public String getUsername() { return username; }
+    public void setUsername(String username) { this.username = username; }
+
+    public String getPassword() { return password; }
+    public void setPassword(String password) { this.password = password; }
+}

backend/src/main/java/com/magistr/app/config/tenant/TenantContext.java

@@ -0,0 +1,22 @@
+package com.magistr.app.config.tenant;
+
+/**
+ * ThreadLocal хранилище текущего тенанта (домена).
+ * Устанавливается в TenantInterceptor на каждый HTTP-запрос.
+ */
+public class TenantContext {
+
+    private static final ThreadLocal<String> CURRENT_TENANT = new ThreadLocal<>();
+
+    public static String getCurrentTenant() {
+        return CURRENT_TENANT.get();
+    }
+
+    public static void setCurrentTenant(String tenant) {
+        CURRENT_TENANT.set(tenant);
+    }
+
+    public static void clear() {
+        CURRENT_TENANT.remove();
+    }
+}

backend/src/main/java/com/magistr/app/config/tenant/TenantDataSourceConfig.java

@@ -0,0 +1,118 @@
+package com.magistr.app.config.tenant;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+import javax.sql.DataSource;
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Конфигурация мультитенантного DataSource.
+ * Загружает тенанты из JSON-файла и регистрирует TenantInterceptor.
+ */
+@Configuration
+public class TenantDataSourceConfig implements WebMvcConfigurer {
+
+    private static final Logger log = LoggerFactory.getLogger(TenantDataSourceConfig.class);
+
+    @Value("${app.tenants.config-path:tenants.json}")
+    private String tenantsConfigPath;
+
+    @Value("${spring.datasource.url:}")
+    private String defaultDbUrl;
+
+    @Value("${spring.datasource.username:}")
+    private String defaultDbUsername;
+
+    @Value("${spring.datasource.password:}")
+    private String defaultDbPassword;
+
+    @Bean
+    public TenantRoutingDataSource tenantRoutingDataSource() {
+        TenantRoutingDataSource routingDataSource = new TenantRoutingDataSource();
+
+        // Загружаем тенантов из JSON
+        List<TenantConfig> tenants = loadTenantsFromFile();
+
+        // Если нет тенантов и есть дефолтный datasource — создаём "default" тенант
+        if (tenants.isEmpty() && !defaultDbUrl.isBlank()) {
+            TenantConfig defaultTenant = new TenantConfig(
+                "Default", "default", defaultDbUrl, defaultDbUsername, defaultDbPassword
+            );
+            tenants.add(defaultTenant);
+            log.info("No tenants config found, using default datasource: {}", defaultDbUrl);
+        }
+
+        // Регистрируем тенантов
+        for (TenantConfig tenant : tenants) {
+            try {
+                routingDataSource.addTenant(tenant);
+            } catch (Exception e) {
+                log.error("Failed to add tenant '{}': {}", tenant.getDomain(), e.getMessage());
+            }
+        }
+
+        if (tenants.isEmpty()) {
+            log.warn("No tenants configured! Backend will fail on DB queries.");
+        }
+
+        return routingDataSource;
+    }
+
+    @Bean
+    public DataSource dataSource(TenantRoutingDataSource tenantRoutingDataSource) {
+        return tenantRoutingDataSource;
+    }
+
+    @Bean
+    public TenantInterceptor tenantInterceptor() {
+        return new TenantInterceptor();
+    }
+
+    @Override
+    public void addInterceptors(InterceptorRegistry registry) {
+        registry.addInterceptor(tenantInterceptor()).addPathPatterns("/**");
+    }
+
+    private List<TenantConfig> loadTenantsFromFile() {
+        File file = new File(tenantsConfigPath);
+        if (!file.exists()) {
+            log.info("Tenants config file not found: {}", tenantsConfigPath);
+            return new ArrayList<>();
+        }
+
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            List<TenantConfig> list = mapper.readValue(file, new TypeReference<>() {});
+            log.info("Loaded {} tenant(s) from {}", list.size(), tenantsConfigPath);
+            return list;
+        } catch (IOException e) {
+            log.error("Failed to read tenants config: {}", e.getMessage());
+            return new ArrayList<>();
+        }
+    }
+
+    /**
+     * Сохраняет текущую конфигурацию тенантов в JSON-файл.
+     */
+    public void saveTenantsToFile(TenantRoutingDataSource routingDataSource) {
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            List<TenantConfig> configs = new ArrayList<>(routingDataSource.getTenantConfigs().values());
+            mapper.writerWithDefaultPrettyPrinter().writeValue(new File(tenantsConfigPath), configs);
+            log.info("Saved {} tenant(s) to {}", configs.size(), tenantsConfigPath);
+        } catch (IOException e) {
+            log.error("Failed to save tenants config: {}", e.getMessage());
+        }
+    }
+}

backend/src/main/java/com/magistr/app/config/tenant/TenantInterceptor.java

@@ -0,0 +1,57 @@
+package com.magistr.app.config.tenant;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.servlet.HandlerInterceptor;
+
+/**
+ * Interceptor: извлекает поддомен из Host header и кладёт в TenantContext.
+ * 
+ * Примеры:
+ *   "swsu.zuev.company" → tenant = "swsu"
+ *   "mgu.zuev.company"  → tenant = "mgu"
+ *   "localhost"          → tenant = "default"
+ *   "localhost:8080"     → tenant = "default"
+ */
+public class TenantInterceptor implements HandlerInterceptor {
+
+    private static final Logger log = LoggerFactory.getLogger(TenantInterceptor.class);
+
+    @Override
+    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
+        String host = request.getHeader("Host");
+        String tenant = resolveTenant(host);
+        TenantContext.setCurrentTenant(tenant);
+        log.debug("Resolved tenant '{}' from Host '{}'", tenant, host);
+        return true;
+    }
+
+    @Override
+    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+        TenantContext.clear();
+    }
+
+    private String resolveTenant(String host) {
+        if (host == null || host.isBlank()) {
+            return "default";
+        }
+
+        // Убираем порт (localhost:8080 → localhost)
+        String hostname = host.contains(":") ? host.substring(0, host.indexOf(':')) : host;
+
+        // localhost или IP → default
+        if ("localhost".equalsIgnoreCase(hostname) || hostname.matches("\\d+\\.\\d+\\.\\d+\\.\\d+")) {
+            return "default";
+        }
+
+        // Извлекаем первый поддомен: swsu.zuev.company → swsu
+        int firstDot = hostname.indexOf('.');
+        if (firstDot > 0) {
+            return hostname.substring(0, firstDot).toLowerCase();
+        }
+
+        return "default";
+    }
+}

backend/src/main/java/com/magistr/app/config/tenant/TenantRoutingDataSource.java

@@ -0,0 +1,124 @@
+package com.magistr.app.config.tenant;
+
+import com.zaxxer.hikari.HikariDataSource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * DataSource, который переключается между БД разных тенантов.
+ * На каждый запрос determineCurrentLookupKey() возвращает текущий тенант из TenantContext.
+ */
+public class TenantRoutingDataSource extends AbstractRoutingDataSource {
+
+    private static final Logger log = LoggerFactory.getLogger(TenantRoutingDataSource.class);
+
+    private final Map<String, TenantConfig> tenantConfigs = new ConcurrentHashMap<>();
+    private final Map<Object, Object> dataSources = new ConcurrentHashMap<>();
+
+    @Override
+    protected Object determineCurrentLookupKey() {
+        String tenant = TenantContext.getCurrentTenant();
+        return tenant != null ? tenant : "default";
+    }
+
+    /**
+     * Добавляет тенант и создаёт для него HikariCP пул.
+     */
+    public void addTenant(TenantConfig config) {
+        String domain = config.getDomain().toLowerCase();
+        HikariDataSource ds = createDataSource(config);
+
+        dataSources.put(domain, ds);
+        tenantConfigs.put(domain, config);
+
+        // Обновляем target data sources
+        setTargetDataSources(dataSources);
+        afterPropertiesSet();
+
+        log.info("Added tenant '{}' -> {}", domain, config.getUrl());
+    }
+
+    /**
+     * Удаляет тенант и закрывает его пул соединений.
+     */
+    public void removeTenant(String domain) {
+        domain = domain.toLowerCase();
+        Object removed = dataSources.remove(domain);
+        tenantConfigs.remove(domain);
+
+        if (removed instanceof HikariDataSource ds) {
+            ds.close();
+            log.info("Removed and closed tenant '{}'", domain);
+        }
+
+        setTargetDataSources(dataSources);
+        afterPropertiesSet();
+    }
+
+    /**
+     * Проверяет подключение к БД для указанного тенанта.
+     */
+    public boolean testConnection(String domain) {
+        DataSource ds = (DataSource) dataSources.get(domain.toLowerCase());
+        if (ds == null) return false;
+
+        try (Connection conn = ds.getConnection()) {
+            return conn.isValid(5);
+        } catch (SQLException e) {
+            log.warn("Connection test failed for tenant '{}': {}", domain, e.getMessage());
+            return false;
+        }
+    }
+
+    /**
+     * Тестирует подключение по произвольным параметрам (без регистрации тенанта).
+     */
+    public String testExternalConnection(String url, String username, String password) {
+        HikariDataSource ds = new HikariDataSource();
+        ds.setJdbcUrl(url);
+        ds.setUsername(username);
+        ds.setPassword(password);
+        ds.setMaximumPoolSize(1);
+        ds.setConnectionTimeout(5000);
+
+        try (Connection conn = ds.getConnection()) {
+            if (conn.isValid(5)) {
+                return "OK";
+            }
+            return "Подключение не валидно";
+        } catch (Exception e) {
+            return e.getMessage();
+        } finally {
+            ds.close();
+        }
+    }
+
+    public Map<String, TenantConfig> getTenantConfigs() {
+        return tenantConfigs;
+    }
+
+    public boolean hasTenant(String domain) {
+        return tenantConfigs.containsKey(domain.toLowerCase());
+    }
+
+    private HikariDataSource createDataSource(TenantConfig config) {
+        HikariDataSource ds = new HikariDataSource();
+        ds.setJdbcUrl(config.getUrl());
+        ds.setUsername(config.getUsername());
+        ds.setPassword(config.getPassword());
+        ds.setPoolName("tenant-" + config.getDomain());
+        ds.setMaximumPoolSize(10);
+        ds.setMinimumIdle(2);
+        ds.setConnectionTimeout(10000);
+        ds.setIdleTimeout(300000);
+        ds.setMaxLifetime(600000);
+        return ds;
+    }
+}

backend/src/main/java/com/magistr/app/controller/DatabaseController.java

@@ -0,0 +1,161 @@
+package com.magistr.app.controller;
+
+import com.magistr.app.config.tenant.TenantConfig;
+import com.magistr.app.config.tenant.TenantContext;
+import com.magistr.app.config.tenant.TenantDataSourceConfig;
+import com.magistr.app.config.tenant.TenantRoutingDataSource;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * API управления подключениями к базам данных (тенантами).
+ * Доступно только для ADMIN.
+ */
+@RestController
+@RequestMapping("/api/database")
+public class DatabaseController {
+
+    private final TenantRoutingDataSource routingDataSource;
+    private final TenantDataSourceConfig dataSourceConfig;
+
+    public DatabaseController(TenantRoutingDataSource routingDataSource,
+                              TenantDataSourceConfig dataSourceConfig) {
+        this.routingDataSource = routingDataSource;
+        this.dataSourceConfig = dataSourceConfig;
+    }
+
+    /**
+     * Статус текущего подключения (по домену запроса).
+     */
+    @GetMapping("/status")
+    public ResponseEntity<Map<String, Object>> getStatus() {
+        String currentTenant = TenantContext.getCurrentTenant();
+        boolean connected = routingDataSource.testConnection(currentTenant);
+
+        TenantConfig config = routingDataSource.getTenantConfigs().get(currentTenant);
+
+        Map<String, Object> result = new HashMap<>();
+        result.put("tenant", currentTenant);
+        result.put("connected", connected);
+        result.put("configured", config != null);
+        if (config != null) {
+            result.put("name", config.getName());
+            result.put("url", maskPassword(config.getUrl()));
+        }
+        return ResponseEntity.ok(result);
+    }
+
+    /**
+     * Список всех тенантов.
+     */
+    @GetMapping("/tenants")
+    public ResponseEntity<List<Map<String, Object>>> getTenants() {
+        List<Map<String, Object>> result = new ArrayList<>();
+
+        for (TenantConfig config : routingDataSource.getTenantConfigs().values()) {
+            Map<String, Object> tenant = new HashMap<>();
+            tenant.put("name", config.getName());
+            tenant.put("domain", config.getDomain());
+            tenant.put("url", maskPassword(config.getUrl()));
+            tenant.put("username", config.getUsername());
+            tenant.put("connected", routingDataSource.testConnection(config.getDomain()));
+            result.add(tenant);
+        }
+
+        return ResponseEntity.ok(result);
+    }
+
+    /**
+     * Добавить новый тенант.
+     */
+    @PostMapping("/tenants")
+    public ResponseEntity<Map<String, Object>> addTenant(@RequestBody TenantConfig config) {
+        Map<String, Object> result = new HashMap<>();
+
+        if (config.getDomain() == null || config.getDomain().isBlank()) {
+            result.put("success", false);
+            result.put("message", "Домен не может быть пустым");
+            return ResponseEntity.badRequest().body(result);
+        }
+
+        if (config.getUrl() == null || config.getUrl().isBlank()) {
+            result.put("success", false);
+            result.put("message", "URL базы данных не может быть пустым");
+            return ResponseEntity.badRequest().body(result);
+        }
+
+        if (routingDataSource.hasTenant(config.getDomain())) {
+            // Обновляем существующий
+            routingDataSource.removeTenant(config.getDomain());
+        }
+
+        try {
+            routingDataSource.addTenant(config);
+            dataSourceConfig.saveTenantsToFile(routingDataSource);
+
+            result.put("success", true);
+            result.put("message", "Тенант '" + config.getDomain() + "' добавлен");
+            return ResponseEntity.ok(result);
+        } catch (Exception e) {
+            result.put("success", false);
+            result.put("message", "Ошибка: " + e.getMessage());
+            return ResponseEntity.internalServerError().body(result);
+        }
+    }
+
+    /**
+     * Удалить тенант.
+     */
+    @DeleteMapping("/tenants/{domain}")
+    public ResponseEntity<Map<String, Object>> removeTenant(@PathVariable String domain) {
+        Map<String, Object> result = new HashMap<>();
+
+        if (!routingDataSource.hasTenant(domain)) {
+            result.put("success", false);
+            result.put("message", "Тенант '" + domain + "' не найден");
+            return ResponseEntity.status(404).body(result);
+        }
+
+        routingDataSource.removeTenant(domain);
+        dataSourceConfig.saveTenantsToFile(routingDataSource);
+
+        result.put("success", true);
+        result.put("message", "Тенант '" + domain + "' удалён");
+        return ResponseEntity.ok(result);
+    }
+
+    /**
+     * Тест подключения к произвольной БД.
+     */
+    @PostMapping("/test")
+    public ResponseEntity<Map<String, Object>> testConnection(@RequestBody Map<String, String> params) {
+        String url = params.get("url");
+        String username = params.get("username");
+        String password = params.get("password");
+
+        Map<String, Object> result = new HashMap<>();
+
+        if (url == null || url.isBlank()) {
+            result.put("success", false);
+            result.put("message", "URL не указан");
+            return ResponseEntity.badRequest().body(result);
+        }
+
+        String testResult = routingDataSource.testExternalConnection(url, username, password);
+        boolean success = "OK".equals(testResult);
+
+        result.put("success", success);
+        result.put("message", success ? "Подключение успешно!" : testResult);
+        return ResponseEntity.ok(result);
+    }
+
+    private String maskPassword(String url) {
+        // Маскируем пароль в JDBC URL, если нужно
+        return url;
+    }
+}

backend/src/main/resources/application.properties

@@ -1,15 +1,18 @@
 server.port=8080
 
-# PostgreSQL
+# PostgreSQL (дефолтный — для локальной разработки через Docker Compose)
 spring.datasource.url=jdbc:postgresql://db:5432/app_db
-spring.datasource.username=${POSTGRES_USER}
-spring.datasource.password=${POSTGRES_PASSWORD}
+spring.datasource.username=${POSTGRES_USER:myuser}
+spring.datasource.password=${POSTGRES_PASSWORD:supersecretpassword}
 spring.datasource.driver-class-name=org.postgresql.Driver
 
 # JPA
-spring.jpa.hibernate.ddl-auto=validate
+spring.jpa.hibernate.ddl-auto=update
 spring.jpa.show-sql=false
 spring.jpa.open-in-view=false
 
-#Eta nastroyka otvechayet za vklyucheniye vidimosti logov urovnya DEBUG v logakh BE, poka vyklyuchil chtoby ne zasoryat'. Zapisi INFO otobrazhat'sya budut
+# Мультитенантность
+app.tenants.config-path=${TENANTS_CONFIG_PATH:tenants.json}
+
 #logging.level.root=DEBUG
+

backend/tenants.json

@@ -0,0 +1,9 @@
+[
+  {
+    "name": "Default (dev)",
+    "domain": "default",
+    "url": "jdbc:postgresql://db:5432/app_db",
+    "username": "myuser",
+    "password": "supersecretpassword"
+  }
+]

frontend/admin/index.html

@@ -95,6 +95,14 @@
                 </svg>
                 Расписание занятий
             </a>
+            <a href="#" class="nav-item" data-tab="database">
+                <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                    <ellipse cx="12" cy="5" rx="9" ry="3"></ellipse>
+                    <path d="M21 12c0 1.66-4 3-9 3s-9-1.34-9-3"></path>
+                    <path d="M3 5v14c0 1.66 4 3 9 3s9-1.34 9-3V5"></path>
+                </svg>
+                База данных
+            </a>
         </nav>
         <div class="sidebar-footer">
             <button class="btn-logout" id="btn-logout">

frontend/admin/js/main.js

@@ -8,6 +8,7 @@ import { initEquipments } from './views/equipments.js';
 import { initClassrooms } from './views/classrooms.js';
 import { initSubjects } from './views/subjects.js';
 import {initSchedule} from "./views/schedule.js";
+import {initDatabase} from "./views/database.js";
 
 // Configuration
 const ROUTES = {
@@ -17,8 +18,8 @@ const ROUTES = {
     equipments: { title: 'Оборудование', file: 'views/equipments.html', init: initEquipments },
     classrooms: { title: 'Аудитории', file: 'views/classrooms.html', init: initClassrooms },
     subjects: { title: 'Дисциплины и преподаватели', file: 'views/subjects.html', init: initSubjects },
-    // Новая вкладка
     schedule: { title: 'Расписание занятий', file: 'views/schedule.html', init: initSchedule },
+    database: { title: 'База данных', file: 'views/database.html', init: initDatabase },
 };
 
 let currentTab = null;

frontend/admin/js/views/database.js

@@ -0,0 +1,157 @@
+import { api } from '../api.js';
+import { escapeHtml, showAlert, hideAlert } from '../utils.js';
+
+export async function initDatabase() {
+    const tenantsTbody = document.getElementById('tenants-tbody');
+    const addTenantForm = document.getElementById('add-tenant-form');
+    const statusInfo = document.getElementById('db-status-info');
+    const btnTest = document.getElementById('btn-test-connection');
+
+    // === Загрузка статуса текущего подключения ===
+    async function loadStatus() {
+        try {
+            const data = await api.get('/api/database/status');
+            const statusBadge = data.connected
+                ? '<span class="badge badge-available">Online</span>'
+                : '<span class="badge badge-unavailable">Offline</span>';
+
+            statusInfo.innerHTML = `
+                <div style="display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;">
+                    <div>
+                        <span style="color: var(--text-secondary); font-size: 0.85rem;">Тенант:</span>
+                        <strong>${escapeHtml(data.tenant || '—')}</strong>
+                    </div>
+                    <div>
+                        <span style="color: var(--text-secondary); font-size: 0.85rem;">Название:</span>
+                        <strong>${escapeHtml(data.name || '—')}</strong>
+                    </div>
+                    <div>
+                        <span style="color: var(--text-secondary); font-size: 0.85rem;">Статус:</span>
+                        ${statusBadge}
+                    </div>
+                    ${data.url ? `<div>
+                        <span style="color: var(--text-secondary); font-size: 0.85rem;">URL:</span>
+                        <code style="font-size: 0.85rem;">${escapeHtml(data.url)}</code>
+                    </div>` : ''}
+                </div>
+            `;
+        } catch (e) {
+            statusInfo.innerHTML = `<div class="form-alert error" style="display:block">Ошибка загрузки статуса: ${e.message}</div>`;
+        }
+    }
+
+    // === Загрузка списка тенантов ===
+    async function loadTenants() {
+        try {
+            const tenants = await api.get('/api/database/tenants');
+            renderTenantsTable(tenants);
+        } catch (e) {
+            tenantsTbody.innerHTML = `<tr><td colspan="6" class="loading-row">Ошибка загрузки: ${e.message}</td></tr>`;
+        }
+    }
+
+    function renderTenantsTable(tenants) {
+        if (!tenants || !tenants.length) {
+            tenantsTbody.innerHTML = '<tr><td colspan="6" class="loading-row">Нет подключённых тенантов</td></tr>';
+            return;
+        }
+
+        tenantsTbody.innerHTML = tenants.map(t => {
+            const statusBadge = t.connected
+                ? '<span class="badge badge-available">Online</span>'
+                : '<span class="badge badge-unavailable">Offline</span>';
+
+            return `
+            <tr>
+                <td>${escapeHtml(t.name || '—')}</td>
+                <td><code>${escapeHtml(t.domain)}</code></td>
+                <td><code style="font-size: 0.82rem;">${escapeHtml(t.url)}</code></td>
+                <td>${escapeHtml(t.username || '—')}</td>
+                <td>${statusBadge}</td>
+                <td><button class="btn-delete" data-domain="${escapeHtml(t.domain)}">Удалить</button></td>
+            </tr>`;
+        }).join('');
+    }
+
+    // === Тест подключения ===
+    btnTest.addEventListener('click', async () => {
+        hideAlert('add-tenant-alert');
+        const url = document.getElementById('tenant-url').value.trim();
+        const username = document.getElementById('tenant-username').value.trim();
+        const password = document.getElementById('tenant-password').value;
+
+        if (!url) {
+            showAlert('add-tenant-alert', 'Введите JDBC URL', 'error');
+            return;
+        }
+
+        btnTest.textContent = '...';
+        btnTest.disabled = true;
+
+        try {
+            const result = await api.post('/api/database/test', { url, username, password });
+            if (result.success) {
+                showAlert('add-tenant-alert', '✓ Подключение успешно!', 'success');
+            } else {
+                showAlert('add-tenant-alert', `✗ ${result.message}`, 'error');
+            }
+        } catch (e) {
+            showAlert('add-tenant-alert', `Ошибка: ${e.message}`, 'error');
+        } finally {
+            btnTest.textContent = 'Тест';
+            btnTest.disabled = false;
+        }
+    });
+
+    // === Добавление тенанта ===
+    addTenantForm.addEventListener('submit', async (e) => {
+        e.preventDefault();
+        hideAlert('add-tenant-alert');
+
+        const name = document.getElementById('tenant-name').value.trim();
+        const domain = document.getElementById('tenant-domain').value.trim().toLowerCase();
+        const url = document.getElementById('tenant-url').value.trim();
+        const username = document.getElementById('tenant-username').value.trim();
+        const password = document.getElementById('tenant-password').value;
+
+        if (!name || !domain || !url) {
+            showAlert('add-tenant-alert', 'Заполните все обязательные поля', 'error');
+            return;
+        }
+
+        try {
+            const result = await api.post('/api/database/tenants', { name, domain, url, username, password });
+            if (result.success) {
+                showAlert('add-tenant-alert', `Тенант "${escapeHtml(domain)}" добавлен!`, 'success');
+                addTenantForm.reset();
+                loadTenants();
+                loadStatus();
+            } else {
+                showAlert('add-tenant-alert', result.message, 'error');
+            }
+        } catch (e) {
+            showAlert('add-tenant-alert', `Ошибка: ${e.message}`, 'error');
+        }
+    });
+
+    // === Удаление тенанта ===
+    tenantsTbody.addEventListener('click', async (e) => {
+        const btn = e.target.closest('.btn-delete');
+        if (!btn) return;
+
+        const domain = btn.dataset.domain;
+        if (!confirm(`Удалить тенант "${domain}"? Пул соединений будет закрыт.`)) return;
+
+        try {
+            await api.delete(`/api/database/tenants/${domain}`);
+            loadTenants();
+            loadStatus();
+        } catch (e) {
+            alert(`Ошибка: ${e.message}`);
+        }
+    });
+
+    // === Init ===
+    loadStatus();
+    loadTenants();
+}

frontend/admin/views/database.html

@@ -0,0 +1,73 @@
+<!-- ===== Database / Tenants Tab ===== -->
+
+<!-- Текущее подключение -->
+<div class="card">
+    <h2>Текущее подключение</h2>
+    <div id="db-status-info" class="db-status-card">
+        <div class="loading-row">Загрузка...</div>
+    </div>
+</div>
+
+<!-- Таблица тенантов -->
+<div class="card">
+    <h2>Подключённые университеты</h2>
+    <div class="table-wrap">
+        <table id="tenants-table">
+            <thead>
+                <tr>
+                    <th>Название</th>
+                    <th>Домен</th>
+                    <th>JDBC URL</th>
+                    <th>Пользователь</th>
+                    <th>Статус</th>
+                    <th>Действия</th>
+                </tr>
+            </thead>
+            <tbody id="tenants-tbody">
+                <tr>
+                    <td colspan="6" class="loading-row">Загрузка...</td>
+                </tr>
+            </tbody>
+        </table>
+    </div>
+</div>
+
+<!-- Добавить тенант -->
+<div class="card create-card">
+    <h2>Добавить подключение</h2>
+    <form id="add-tenant-form">
+        <div class="form-row">
+            <div class="form-group">
+                <label for="tenant-name">Название университета</label>
+                <input type="text" id="tenant-name" placeholder="ЮЗГУ" required>
+            </div>
+            <div class="form-group">
+                <label for="tenant-domain">Поддомен</label>
+                <input type="text" id="tenant-domain" placeholder="swsu" required>
+            </div>
+        </div>
+        <div class="form-row" style="margin-top: 0.75rem;">
+            <div class="form-group" style="flex: 3;">
+                <label for="tenant-url">JDBC URL</label>
+                <input type="text" id="tenant-url" placeholder="jdbc:postgresql://192.168.1.50:5432/magistr_db" required>
+            </div>
+        </div>
+        <div class="form-row" style="margin-top: 0.75rem;">
+            <div class="form-group">
+                <label for="tenant-username">Пользователь</label>
+                <input type="text" id="tenant-username" placeholder="postgres" required>
+            </div>
+            <div class="form-group">
+                <label for="tenant-password">Пароль</label>
+                <input type="password" id="tenant-password" placeholder="••••••••" required>
+            </div>
+            <button type="button" class="btn-primary" id="btn-test-connection" style="height: fit-content;">
+                Тест
+            </button>
+            <button type="submit" class="btn-primary" style="height: fit-content;">
+                Добавить
+            </button>
+        </div>
+        <div class="form-alert" id="add-tenant-alert" role="alert"></div>
+    </form>
+</div>