[Feat] McpAccessToken 엔티티 및 Flyway 마이그레이션 추가

src/main/java/com/opensource/docgrid/domain/user/entity/McpAccessToken.java

@@ -0,0 +1,70 @@
+package com.opensource.docgrid.domain.user.entity;
+
+import java.time.LocalDateTime;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Index;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(
+        name = "mcp_access_tokens",
+        indexes = {
+                @Index(name = "idx_mcp_access_tokens_user_id", columnList = "user_id")
+        }
+)
+public class McpAccessToken {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id", nullable = false)
+    private User user;
+
+    @Column(name = "token_hash", nullable = false, length = 255)
+    private String tokenHash;
+
+    // BaseEntity 미사용 — updated_at 없는 스키마에 맞춰 직접 관리
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @Column(name = "last_used_at")
+    private LocalDateTime lastUsedAt;
+
+    @Column(name = "revoked_at")
+    private LocalDateTime revokedAt;
+
+    @Builder
+    public McpAccessToken(User user, String tokenHash) {
+        this.user = user;
+        this.tokenHash = tokenHash;
+        this.createdAt = LocalDateTime.now();
+    }
+
+    public void recordUsage(LocalDateTime usedAt) {
+        this.lastUsedAt = usedAt;
+    }
+
+    public void revoke(LocalDateTime revokedAt) {
+        this.revokedAt = revokedAt;
+    }
+
+    public boolean isRevoked() {
+        return this.revokedAt != null;
+    }
+}

src/main/resources/db/migration/V26__create_mcp_access_tokens.sql

@@ -0,0 +1,11 @@
+-- mcp_access_tokens: MCP API 접근 토큰 테이블
+CREATE TABLE mcp_access_tokens (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT NOT NULL REFERENCES users(id),
+    token_hash VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT now(),
+    last_used_at TIMESTAMP,
+    revoked_at TIMESTAMP
+);
+
+CREATE INDEX idx_mcp_access_tokens_user_id ON mcp_access_tokens (user_id);