feat: add analytics-service (Spring Cloud Gateway + Consul)

analytics-service/src/main/resources/application-prod.yml

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+spring:
+  datasource:
+    url: jdbc:postgresql://${DB_HOST:postgres}:${DB_PORT:5432}/${DB_NAME:appdb}?currentSchema=analytics
+
+  kafka:
+    bootstrap-servers: ${KAFKA_BOOTSTRAP_SERVERS:kafka:9092}
+
+  cloud:
+    consul:
+      host: ${CONSUL_HOST:consul}
+      port: ${CONSUL_PORT:8500}
+
+logging:
+  level:
+    root: WARN
+    com.posthub.analytics: INFO

analytics-service/src/main/resources/application.yml

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+server:
+  port: 8082
+
+spring:
+  application:
+    name: analytics-service
+
+  datasource:
+    url: jdbc:postgresql://${DB_HOST:localhost}:${DB_PORT:5432}/${DB_NAME:appdb}?currentSchema=analytics
+    username: ${DB_USERNAME:app}
+    password: ${DB_PASSWORD:}
+    hikari:
+      maximum-pool-size: 5
+
+  jpa:
+    hibernate:
+      ddl-auto: validate
+    properties:
+      hibernate:
+        default_schema: analytics
+    open-in-view: false
+
+  flyway:
+    enabled: true
+    schemas: analytics
+    default-schema: analytics
+
+  kafka:
+    bootstrap-servers: ${KAFKA_BOOTSTRAP_SERVERS:localhost:9092}
+    consumer:
+      group-id: analytics-group
+      auto-offset-reset: earliest
+
+  cloud:
+    consul:
+      host: ${CONSUL_HOST:localhost}
+      port: ${CONSUL_PORT:8500}
+      discovery:
+        register: true
+        enabled: true
+        health-check-path: /actuator/health
+        health-check-interval: 15s
+        prefer-ip-address: true
+        instance-id: ${spring.application.name}:${random.value}
+
+analytics:
+  kafka:
+    topic: user-events
+
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info
+  endpoint:
+    health:
+      show-details: always
+
+logging:
+  level:
+    root: INFO
+    com.posthub.analytics: DEBUG

analytics-service/src/main/resources/db/migration/V1__create_analytics_tables.sql

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+CREATE TABLE event_log (
+    id              BIGSERIAL PRIMARY KEY,
+    event_type      VARCHAR(50)  NOT NULL,
+    user_id         VARCHAR(255) NOT NULL,
+    chat_id         VARCHAR(255),
+    tokens_used     INTEGER,
+    documents_found INTEGER,
+    event_timestamp TIMESTAMP WITH TIME ZONE NOT NULL,
+    event_date      DATE NOT NULL
+);
+
+CREATE INDEX idx_event_log_type ON event_log(event_type);
+CREATE INDEX idx_event_log_user ON event_log(user_id);
+CREATE INDEX idx_event_log_date ON event_log(event_date);
+
+CREATE TABLE daily_stats (
+    id                   BIGSERIAL PRIMARY KEY,
+    stats_date           DATE NOT NULL UNIQUE,
+    total_queries        BIGINT  DEFAULT 0,
+    total_tokens_used    BIGINT  DEFAULT 0,
+    total_rag_hits       BIGINT  DEFAULT 0,
+    total_documents_found BIGINT DEFAULT 0,
+    new_users            BIGINT  DEFAULT 0,
+    new_chats            BIGINT  DEFAULT 0,
+    deleted_chats        BIGINT  DEFAULT 0,
+    active_users         INTEGER DEFAULT 0
+);
+
+CREATE TABLE user_stats (
+    id               BIGSERIAL PRIMARY KEY,
+    user_id          VARCHAR(255) NOT NULL UNIQUE,
+    total_queries    BIGINT  DEFAULT 0,
+    total_tokens_used BIGINT DEFAULT 0,
+    total_rag_hits   BIGINT  DEFAULT 0,
+    total_chats      INTEGER DEFAULT 0,
+    first_seen       TIMESTAMP WITH TIME ZONE,
+    last_active      TIMESTAMP WITH TIME ZONE
+);

analytics-service/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <property name="LOG_PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n"/>
+
+    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>${LOG_PATTERN}</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="CONSOLE"/>
+    </root>
+</configuration>