feat: Integrate OpenTelemetry for distributed tracing in both frontend and backend applications.

backend/Dockerfile

@@ -4,6 +4,7 @@ COPY pom.xml .
 RUN mvn dependency:go-offline -B
 COPY src ./src
 RUN mvn package -DskipTests -B
+RUN curl -L -o opentelemetry-javaagent.jar https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/latest/download/opentelemetry-javaagent.jar
 
 FROM eclipse-temurin:17-jre-alpine
 
@@ -13,5 +14,6 @@ USER spring:spring
 
 WORKDIR /app
 COPY --from=build /app/target/app.jar app.jar
+COPY --from=build /app/opentelemetry-javaagent.jar opentelemetry-javaagent.jar
 EXPOSE 8080
-ENTRYPOINT ["java", "-jar", "app.jar"]
+ENTRYPOINT ["java", "-javaagent:opentelemetry-javaagent.jar", "-jar", "app.jar"]

backend/pom.xml

@@ -56,6 +56,13 @@
             <artifactId>h2</artifactId>
             <scope>runtime</scope>
         </dependency>
+
+        <!-- OpenTelemetry API for custom span attributes -->
+        <dependency>
+            <groupId>io.opentelemetry</groupId>
+            <artifactId>opentelemetry-api</artifactId>
+            <version>1.49.0</version>
+        </dependency>
     </dependencies>
 
     <build>

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

@@ -9,6 +9,8 @@ import org.springframework.web.servlet.HandlerInterceptor;
 
 import java.io.IOException;
 import java.util.Map;
+import org.slf4j.MDC;
+import io.opentelemetry.api.trace.Span;
 
 /**
  * Interceptor: извлекает поддомен из Host header и кладёт в TenantContext.
@@ -48,6 +50,8 @@ public class TenantInterceptor implements HandlerInterceptor {
         // (нужно чтобы админ мог добавить тенант даже если его домен не настроен)
         if (path.startsWith("/api/database")) {
             TenantContext.setCurrentTenant(tenant);
+            MDC.put("tenant.id", tenant);
+            Span.current().setAttribute("tenant.id", tenant);
             log.debug("Database API request, tenant '{}' (no strict check)", tenant);
             return true;
         }
@@ -66,6 +70,8 @@ public class TenantInterceptor implements HandlerInterceptor {
         }
 
         TenantContext.setCurrentTenant(tenant);
+        MDC.put("tenant.id", tenant);
+        Span.current().setAttribute("tenant.id", tenant);
         log.debug("Resolved tenant '{}' from Host '{}'", tenant, host);
         return true;
     }
@@ -73,6 +79,7 @@ public class TenantInterceptor implements HandlerInterceptor {
     @Override
     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
         TenantContext.clear();
+        MDC.remove("tenant.id");
     }
 
     private String resolveTenant(String host) {

backend/src/main/resources/db/migration/V2__departmentCreate.sql

@@ -127,8 +127,7 @@ COMMENT ON TABLE equipments IS 'Оборудование';
 COMMENT ON TABLE classrooms IS 'Аудитории';
 COMMENT ON TABLE classroom_equipments IS 'Привязка оборудования к аудиториям';
 COMMENT ON TABLE teacher_subjects IS 'Привязка преподавателей к дисциплинам';
-COMMENT ON TABLE equipments IS 'Оборудование';
+COMMENT ON TABLE teacher_lesson_types IS 'Типы занятий преподавателя';
-COMMENT ON TABLE equipments IS 'Оборудование';
 
 
 COMMENT ON COLUMN users.id IS 'ID пользователя';
@@ -200,3 +199,25 @@ COMMENT ON COLUMN lessons.classroom_id IS 'ID аудитории, в котор
 COMMENT ON COLUMN lessons.day IS 'День недели, в который проходит урок';
 COMMENT ON COLUMN lessons.week IS 'Номер недели, в которой проходит урок';
 COMMENT ON COLUMN lessons.time IS 'Время урока';
+
+COMMENT ON COLUMN departments.id IS 'ID кафедры';
+COMMENT ON COLUMN departments.name IS 'Название кафедры';
+COMMENT ON COLUMN departments.code IS 'Код кафедры';
+
+COMMENT ON COLUMN specialties.id IS 'ID специальности';
+COMMENT ON COLUMN specialties.name IS 'Название специальности';
+COMMENT ON COLUMN specialties.specialty_code IS 'Код специальности';
+
+COMMENT ON COLUMN teacher_lesson_types.user_id IS 'ID преподавателя';
+COMMENT ON COLUMN teacher_lesson_types.subject_id IS 'ID предмета';
+COMMENT ON COLUMN teacher_lesson_types.lesson_type_id IS 'ID типа занятия';
+
+COMMENT ON COLUMN schedule_data.id IS 'ID записи данных расписания';
+
+COMMENT ON COLUMN subjects.department_id IS 'ID кафедры';
+
+COMMENT ON COLUMN student_groups.department_id IS 'ID кафедры';
+
+COMMENT ON COLUMN users.full_name IS 'ФИО пользователя';
+COMMENT ON COLUMN users.job_title IS 'Должность пользователя';
+COMMENT ON COLUMN users.department_id IS 'ID кафедры';

frontend/script.js

@@ -1,6 +1,32 @@
 (() => {
   'use strict';
 
+  // --- OpenTelemetry Frontend Instrumentation ---
+  // Загружаем OTel Web SDK динамически через esm.sh, чтобы не ломать старый Vanilla JS (без type="module")
+  import('https://esm.sh/@opentelemetry/sdk-trace-web').then(async ({ WebTracerProvider, BatchSpanProcessor }) => {
+    const { OTLPTraceExporter } = await import('https://esm.sh/@opentelemetry/exporter-trace-otlp-http');
+    const { getWebAutoInstrumentations } = await import('https://esm.sh/@opentelemetry/auto-instrumentations-web');
+    const { registerInstrumentations } = await import('https://esm.sh/@opentelemetry/instrumentation');
+    const { Resource } = await import('https://esm.sh/@opentelemetry/resources');
+
+    const exporter = new OTLPTraceExporter({
+      url: window.location.origin + '/otel/v1/traces' // Трафик пойдет через ваш Caddy Proxy
+    });
+    
+    const provider = new WebTracerProvider({
+      resource: new Resource({ 'service.name': 'magistr-frontend' }),
+    });
+    
+    provider.addSpanProcessor(new BatchSpanProcessor(exporter));
+    provider.register();
+
+    registerInstrumentations({
+      instrumentations: [getWebAutoInstrumentations()]
+    });
+    console.log("SigNoz (OpenTelemetry) инициализирован во фронтенде.");
+  }).catch(e => console.error("Ошибка загрузки OTel:", e));
+  // ----------------------------------------------
+
   const form = document.getElementById('login-form');
   const usernameInput = document.getElementById('username');
   const passwordInput = document.getElementById('password');