tsk-19: Update status of scheduled message endpoint (#32)

Closes #19

Reviewed-on: phoenix/textsender-api#32
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/store/scheduled_message_store.go

@@ -14,6 +14,7 @@ import (
 type ScheduledMessageStore interface {
 	Get(ctx context.Context, id uuid.UUID) (*scheduling.ScheduledMessage, error)
 	CreateScheduledMessage(ctx context.Context, schedMsg *scheduling.ScheduledMessage) error
+	UpdateStatus(ctx context.Context, id uuid.UUID, updatedStatus string) (*string, error)
 }
 
 type PGScheduledMessageStore struct {
@@ -54,3 +55,18 @@ func (s *PGScheduledMessageStore) CreateScheduledMessage(ctx context.Context, sc
 		&schedMsg.Id, &schedMsg.Created,
 	)
 }
+
+func (s *PGScheduledMessageStore) UpdateStatus(ctx context.Context, id uuid.UUID, updatedStatus string) (*string, error) {
+	query := `
+		UPDATE scheduled_messages set status = $1 WHERE id = $2
+		RETURNING status
+	`
+
+	var returnedStatus string
+
+	if err := s.db.QueryRow(ctx, query, updatedStatus, id).Scan(&returnedStatus); err != nil {
+		return nil, err
+	} else {
+		return &returnedStatus, nil
+	}
+}