feat(backthink): 后台自主思考（heartbeat+事件触发 + 打扰决策 fail-closed + 主动推送活跃→IM 兜底 + 限制 + 思考记录）

internal/services/backthink/store_test.go

@@ -0,0 +1,86 @@
+package backthink
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestStore_AppendList(t *testing.T) {
+	t.Parallel()
+	s, err := NewStore(context.Background(), newTestDB(t), discardLog())
+	if err != nil {
+		t.Fatalf("NewStore: %v", err)
+	}
+
+	base := time.Date(2026, 9, 6, 10, 0, 0, 0, time.UTC)
+	for i := 0; i < 3; i++ {
+		id, err := s.Append(context.Background(), Record{
+			Trigger:    "iot.device_update",
+			At:         base.Add(time.Duration(i) * time.Minute),
+			Conclusion: "nothing to report",
+			ShouldPush: i%2 == 0,
+			PushResult: PushResult{Pushed: i == 2, Route: RouteActiveClient, Detail: "ok"},
+		})
+		if err != nil {
+			t.Fatalf("Append %d: %v", i, err)
+		}
+		if id != int64(i+1) {
+			t.Fatalf("Append id = %d, want %d", id, i+1)
+		}
+	}
+
+	records, err := s.List(context.Background(), 0)
+	if err != nil {
+		t.Fatalf("List: %v", err)
+	}
+	if len(records) != 3 {
+		t.Fatalf("len = %d, want 3", len(records))
+	}
+	// Newest first (descending id).
+	if records[0].ID != 3 || records[1].ID != 2 || records[2].ID != 1 {
+		t.Fatalf("order = %d,%d,%d, want 3,2,1", records[0].ID, records[1].ID, records[2].ID)
+	}
+	if !records[0].ShouldPush {
+		t.Fatalf("records[0].ShouldPush = false, want true")
+	}
+	if !records[0].PushResult.Pushed || records[0].PushResult.Route != RouteActiveClient {
+		t.Fatalf("records[0].PushResult = %+v, want pushed active_client", records[0].PushResult)
+	}
+	if !records[0].At.Equal(base.Add(2 * time.Minute)) {
+		t.Fatalf("records[0].At = %v, want %v", records[0].At, base.Add(2*time.Minute))
+	}
+}
+
+func TestStore_List_Limit(t *testing.T) {
+	t.Parallel()
+	s, err := NewStore(context.Background(), newTestDB(t), discardLog())
+	if err != nil {
+		t.Fatalf("NewStore: %v", err)
+	}
+	for i := 0; i < 5; i++ {
+		if _, err := s.Append(context.Background(), Record{Trigger: "heartbeat", Conclusion: "x"}); err != nil {
+			t.Fatalf("Append %d: %v", i, err)
+		}
+	}
+
+	records, err := s.List(context.Background(), 2)
+	if err != nil {
+		t.Fatalf("List: %v", err)
+	}
+	if len(records) != 2 {
+		t.Fatalf("len = %d, want 2", len(records))
+	}
+	if records[0].ID != 5 || records[1].ID != 4 {
+		t.Fatalf("ids = %d,%d, want 5,4", records[0].ID, records[1].ID)
+	}
+}
+
+func TestStore_NewStore_NilDB(t *testing.T) {
+	t.Parallel()
+	_, err := NewStore(context.Background(), nil, discardLog())
+	if !errors.Is(err, ErrNilDB) {
+		t.Fatalf("err = %v, want ErrNilDB", err)
+	}
+}