Add Full system backup feature (#13945)

src/Jellyfin.Database/Jellyfin.Database.Implementations/Entities/TrickplayInfo.cs

@@ -14,7 +14,6 @@ public class TrickplayInfo
     /// <remarks>
     /// Required.
     /// </remarks>
-    [JsonIgnore]
     public Guid ItemId { get; set; }
 
     /// <summary>

src/Jellyfin.Database/Jellyfin.Database.Implementations/Entities/User.cs

@@ -61,7 +61,6 @@ namespace Jellyfin.Database.Implementations.Entities
         /// <remarks>
         /// Identity, Indexed, Required.
         /// </remarks>
-        [JsonIgnore]
         public Guid Id { get; set; }
 
         /// <summary>

src/Jellyfin.Database/Jellyfin.Database.Implementations/IJellyfinDatabaseProvider.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
@@ -62,4 +63,12 @@ public interface IJellyfinDatabaseProvider
     /// <param name="cancellationToken">A cancellation token.</param>
     /// <returns>A <see cref="Task"/> representing the result of the asynchronous operation.</returns>
     Task RestoreBackupFast(string key, CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Removes all contents from the database.
+    /// </summary>
+    /// <param name="dbContext">The Database context.</param>
+    /// <param name="tableNames">The names of the tables to purge or null for all tables to be purged.</param>
+    /// <returns>A Task.</returns>
+    Task PurgeDatabase(JellyfinDbContext dbContext, IEnumerable<string>? tableNames);
 }

src/Jellyfin.Database/Jellyfin.Database.Providers.Sqlite/SqliteDatabaseProvider.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
 using System.Threading;
@@ -82,7 +83,7 @@ public sealed class SqliteDatabaseProvider : IJellyfinDatabaseProvider
         }
 
         // Run before disposing the application
-        var context = await DbContextFactory!.CreateDbContextAsync(cancellationToken).ConfigureAwait(false);
+        var context = await DbContextFactory.CreateDbContextAsync(cancellationToken).ConfigureAwait(false);
         await using (context.ConfigureAwait(false))
         {
             await context.Database.ExecuteSqlRawAsync("PRAGMA optimize", cancellationToken).ConfigureAwait(false);
@@ -127,4 +128,25 @@ public sealed class SqliteDatabaseProvider : IJellyfinDatabaseProvider
         File.Copy(backupFile, path, true);
         return Task.CompletedTask;
     }
+
+    /// <inheritdoc/>
+    public async Task PurgeDatabase(JellyfinDbContext dbContext, IEnumerable<string>? tableNames)
+    {
+        ArgumentNullException.ThrowIfNull(tableNames);
+
+        var deleteQueries = new List<string>();
+        foreach (var tableName in tableNames)
+        {
+            deleteQueries.Add($"DELETE FROM \"{tableName}\";");
+        }
+
+        var deleteAllQuery =
+        $"""
+        PRAGMA foreign_keys = OFF;
+        {string.Join('\n', deleteQueries)}
+        PRAGMA foreign_keys = ON;
+        """;
+
+        await dbContext.Database.ExecuteSqlRawAsync(deleteAllQuery).ConfigureAwait(false);
+    }
 }