自选项目实验优化

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

@@ -104,6 +104,8 @@ public sealed class DevelopmentSqliteMigrator(
         "20260809_54_experiment_course_grades";
     private const string NotificationInboxIndexesMigration =
         "20260810_55_notification_inbox_indexes";
+    private const string SelfScheduledExperimentSelectionMigration =
+        "20260811_56_self_scheduled_experiment_selection";
 
     public async Task MigrateAsync(CancellationToken cancellationToken = default)
     {
@@ -737,6 +739,10 @@ public sealed class DevelopmentSqliteMigrator(
             NotificationInboxIndexesMigration,
             NotificationInboxIndexesStatements,
             cancellationToken);
+        await ApplyMigrationAsync(
+            SelfScheduledExperimentSelectionMigration,
+            SelfScheduledExperimentSelectionStatements,
+            cancellationToken);
     }
 
     private async Task ApplyMigrationAsync(
@@ -3129,6 +3135,27 @@ public sealed class DevelopmentSqliteMigrator(
         """
     ];
 
+    private static readonly string[] SelfScheduledExperimentSelectionStatements =
+    [
+        "ALTER TABLE \"ExperimentProjects\" ADD COLUMN \"SelectionStartsAt\" TEXT NULL;",
+        "ALTER TABLE \"ExperimentProjects\" ADD COLUMN \"SelectionEndsAt\" TEXT NULL;",
+        """
+        CREATE TABLE "ExperimentSessionInstructors" (
+            "Id" TEXT NOT NULL CONSTRAINT "PK_ExperimentSessionInstructors" PRIMARY KEY,
+            "ExperimentSessionId" TEXT NOT NULL,
+            "TeacherId" TEXT NOT NULL,
+            "CreatedAt" TEXT NOT NULL,
+            "UpdatedAt" TEXT NOT NULL,
+            CONSTRAINT "FK_ExperimentSessionInstructors_ExperimentSessions_ExperimentSessionId"
+                FOREIGN KEY ("ExperimentSessionId") REFERENCES "ExperimentSessions" ("Id") ON DELETE CASCADE,
+            CONSTRAINT "FK_ExperimentSessionInstructors_Teachers_TeacherId"
+                FOREIGN KEY ("TeacherId") REFERENCES "Teachers" ("Id") ON DELETE RESTRICT
+        );
+        """,
+        "CREATE UNIQUE INDEX \"IX_ExperimentSessionInstructors_ExperimentSessionId_TeacherId\" ON \"ExperimentSessionInstructors\" (\"ExperimentSessionId\", \"TeacherId\");",
+        "CREATE INDEX \"IX_ExperimentSessionInstructors_TeacherId\" ON \"ExperimentSessionInstructors\" (\"TeacherId\");"
+    ];
+
     private static readonly string[] ReusableCourseGroupsStatements =
     [
         """