reset watermarks (#263)

ErsatzTV.Infrastructure/Migrations/20210614183841_Reset_ChannelWatermarks.cs

@@ -0,0 +1,18 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Reset_ChannelWatermarks : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.Sql("UPDATE Channel SET WatermarkId = NULL");
+            migrationBuilder.Sql("DELETE FROM ChannelWatermark");
+            migrationBuilder.Sql("DELETE FROM ConfigElement WHERE Key LIKE '%watermark%'");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+        }
+    }
+}