已完成“成绩管理与学业档案”模块：

教师批量录入平时、期中、期末成绩。
自动计算总评、绩点和及格状态。
支持缺考、缓考、免修。
教师提交 → 学院审核/退回 → 校级发布。
学生只能查看正式发布成绩。
自动统计平均分、完成度、及格率和加权 GPA。
SQLite 本地增量升级和 MySQL 正式迁移均已完成。
分级权限在前后端同时校验。

src/Jiaowu.Api/Infrastructure/Persistence/DevelopmentSqliteMigrator.cs

@@ -12,6 +12,7 @@ public sealed class DevelopmentSqliteMigrator(
     private const string SchedulesMigration = "20260724_04_schedules";
     private const string ClassCounselorMigration = "20260724_05_class_counselor";
     private const string CourseSelectionMigration = "20260724_06_course_selection";
+    private const string GradesMigration = "20260724_07_grades";
 
     public async Task MigrateAsync(CancellationToken cancellationToken = default)
     {
@@ -63,6 +64,10 @@ public sealed class DevelopmentSqliteMigrator(
             CourseSelectionMigration,
             CourseSelectionStatements,
             cancellationToken);
+        await ApplyMigrationAsync(
+            GradesMigration,
+            GradesStatements,
+            cancellationToken);
     }
 
     private async Task ApplyMigrationAsync(
@@ -506,4 +511,62 @@ public sealed class DevelopmentSqliteMigrator(
             ON "CourseEnrollments" ("StudentId", "Status");
         """
     ];
+
+    private static readonly string[] GradesStatements =
+    [
+        """
+        CREATE TABLE IF NOT EXISTS "GradeSheets" (
+            "Id" TEXT NOT NULL CONSTRAINT "PK_GradeSheets" PRIMARY KEY,
+            "TeachingTaskId" TEXT NOT NULL,
+            "RegularWeight" TEXT NOT NULL,
+            "MidtermWeight" TEXT NOT NULL,
+            "FinalWeight" TEXT NOT NULL,
+            "Status" INTEGER NOT NULL,
+            "ReviewComment" TEXT NULL,
+            "SubmittedAt" TEXT NULL,
+            "ReviewedAt" TEXT NULL,
+            "PublishedAt" TEXT NULL,
+            "CreatedAt" TEXT NOT NULL,
+            "UpdatedAt" TEXT NOT NULL,
+            CONSTRAINT "FK_GradeSheets_TeachingTasks_TeachingTaskId"
+                FOREIGN KEY ("TeachingTaskId") REFERENCES "TeachingTasks" ("Id") ON DELETE RESTRICT
+        );
+        """,
+        """
+        CREATE UNIQUE INDEX IF NOT EXISTS "IX_GradeSheets_TeachingTaskId"
+            ON "GradeSheets" ("TeachingTaskId");
+        """,
+        """
+        CREATE INDEX IF NOT EXISTS "IX_GradeSheets_Status"
+            ON "GradeSheets" ("Status");
+        """,
+        """
+        CREATE TABLE IF NOT EXISTS "GradeRecords" (
+            "Id" TEXT NOT NULL CONSTRAINT "PK_GradeRecords" PRIMARY KEY,
+            "GradeSheetId" TEXT NOT NULL,
+            "StudentId" TEXT NOT NULL,
+            "RegularScore" TEXT NULL,
+            "MidtermScore" TEXT NULL,
+            "FinalScore" TEXT NULL,
+            "TotalScore" TEXT NULL,
+            "GradePoint" TEXT NULL,
+            "ExamStatus" INTEGER NOT NULL,
+            "Notes" TEXT NULL,
+            "CreatedAt" TEXT NOT NULL,
+            "UpdatedAt" TEXT NOT NULL,
+            CONSTRAINT "FK_GradeRecords_GradeSheets_GradeSheetId"
+                FOREIGN KEY ("GradeSheetId") REFERENCES "GradeSheets" ("Id") ON DELETE CASCADE,
+            CONSTRAINT "FK_GradeRecords_Students_StudentId"
+                FOREIGN KEY ("StudentId") REFERENCES "Students" ("Id") ON DELETE RESTRICT
+        );
+        """,
+        """
+        CREATE UNIQUE INDEX IF NOT EXISTS "IX_GradeRecords_GradeSheetId_StudentId"
+            ON "GradeRecords" ("GradeSheetId", "StudentId");
+        """,
+        """
+        CREATE INDEX IF NOT EXISTS "IX_GradeRecords_StudentId_TotalScore"
+            ON "GradeRecords" ("StudentId", "TotalScore");
+        """
+    ];
 }