add library scan progress detail (#133)

* add library scan progress detail

* scan plex libraries on plex thread

ErsatzTV.Infrastructure/Migrations/20210404121830_Add_LibraryPath_LastScan.cs

@@ -0,0 +1,20 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_LibraryPath_LastScan : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.AddColumn<DateTime>(
+                "LastScan",
+                "LibraryPath",
+                "TEXT",
+                nullable: true);
+
+        protected override void Down(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.DropColumn(
+                "LastScan",
+                "LibraryPath");
+    }
+}

ErsatzTV.Infrastructure/Migrations/20210404122137_Update_LibraryPathLastScan_LibraryLastScan.cs

@@ -0,0 +1,18 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Update_LibraryPathLastScan_LibraryLastScan : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.Sql(
+                @"UPDATE LibraryPath SET LastScan =
+                (SELECT LastScan FROM Library L
+                INNER JOIN LocalLibrary LL on L.Id = LL.Id
+                WHERE LibraryPath.LibraryId = L.Id)");
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+        }
+    }
+}