feat(claude-do): depends_on als Menge statt Einzelfeld

Ein Task kann jetzt auf beliebig viele Vorgaenger warten. Die Einzelspalte tasks.depends_on_task_id wird durch die Beziehungstabelle task_dependencies ersetzt (Composite-PK, beide FKs ON DELETE CASCADE -- das reproduziert das alte ON DELETE SET NULL: geloeschter Vorgaenger = Kante weg = Task wieder pickbar). BlockedByTaskId bleibt unberuehrt. - Migration AddTaskDependencies kopiert jede bestehende depends_on_task_id verlustfrei in die Tabelle, bevor die Spalte fallengelassen wird - QueuePicker gatet per doppelt negiertem NOT EXISTS: kein Task mit 0 Kanten wird blockiert, alle Kanten muessen done sein, eine Kante auf einen verschwundenen Task blockiert weiter - SetDependsOnAsync ersetzt die ganze Menge; Zykluspruefung ist jetzt eine BFS ueber den Graphen, faengt also auch A->B->C->A - blockedReason nennt alle offenen Vorgaenger (External/TaskBlocking, von ExternalMcpService und TaskWaitMcpTools gemeinsam genutzt) - add_task/update_task nehmen dependsOnTaskIds; die alte Skalarform bleibt als Ein-Element-Menge inkl. ""-Clear-Sentinel gueltig - UI: Fan-in-Zeile bleibt flach und listet alle Vorgaenger im After-Label, die lineare Kette rendert unveraendert
2026-09-02 15:08:05 +02:00
parent 84d955dfc7
commit c25732cff8
31 changed files with 1893 additions and 206 deletions
@@ -0,0 +1,104 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ClaudeDo.Data.Migrations
+{
+    /// <summary>
+    /// Turns the single <c>tasks.depends_on_task_id</c> column into a set: one row per declared
+    /// "run after" edge in <c>task_dependencies</c>. Hand-edited after scaffolding so the data copy
+    /// sits between CreateTable and DropColumn — the scaffolded order dropped the column first and
+    /// would have discarded every existing link.
+    /// </summary>
+    public partial class AddTaskDependencies : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "task_dependencies",
+                columns: table => new
+                {
+                    task_id = table.Column<string>(type: "TEXT", nullable: false),
+                    depends_on_task_id = table.Column<string>(type: "TEXT", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_task_dependencies", x => new { x.task_id, x.depends_on_task_id });
+                    table.ForeignKey(
+                        name: "FK_task_dependencies_tasks_depends_on_task_id",
+                        column: x => x.depends_on_task_id,
+                        principalTable: "tasks",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_task_dependencies_tasks_task_id",
+                        column: x => x.task_id,
+                        principalTable: "tasks",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "idx_task_dependencies_depends_on",
+                table: "task_dependencies",
+                column: "depends_on_task_id");
+
+            // Every existing link becomes a one-element set. The old FK was ON DELETE SET NULL, so
+            // a surviving value always points at an existing task and can't violate the new FK.
+            migrationBuilder.Sql("""
+                INSERT INTO task_dependencies (task_id, depends_on_task_id)
+                SELECT id, depends_on_task_id FROM tasks WHERE depends_on_task_id IS NOT NULL
+                """);
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_tasks_tasks_depends_on_task_id",
+                table: "tasks");
+
+            migrationBuilder.DropIndex(
+                name: "idx_tasks_depends_on",
+                table: "tasks");
+
+            migrationBuilder.DropColumn(
+                name: "depends_on_task_id",
+                table: "tasks");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "depends_on_task_id",
+                table: "tasks",
+                type: "TEXT",
+                nullable: true);
+
+            // Inherently lossy: a task with several predecessors keeps only one. There is no
+            // single-column shape that could hold the rest.
+            migrationBuilder.Sql("""
+                UPDATE tasks SET depends_on_task_id = (
+                    SELECT td.depends_on_task_id FROM task_dependencies td
+                    WHERE td.task_id = tasks.id
+                    ORDER BY td.depends_on_task_id
+                    LIMIT 1
+                )
+                """);
+
+            migrationBuilder.DropTable(
+                name: "task_dependencies");
+
+            migrationBuilder.CreateIndex(
+                name: "idx_tasks_depends_on",
+                table: "tasks",
+                column: "depends_on_task_id");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_tasks_tasks_depends_on_task_id",
+                table: "tasks",
+                column: "depends_on_task_id",
+                principalTable: "tasks",
+                principalColumn: "id",
+                onDelete: ReferentialAction.SetNull);
+        }
+    }
+}