Code for a new SQLite adapter

[felixsevero]

Hi, I have used the code below to clean up a SQLite database.
I'm posting it here, in case anyone wants to create a new adapter.

using Dapper;
using System.Data.Common;
using System.Text;

namespace Test;

public sealed class DatabaseCleaner {

	readonly DatabaseConnectionFactory databaseConnectionFactory;
	readonly IEnumerable<string> ignoredTables = ["sqlite_sequence"];

	public DatabaseCleaner(DatabaseConnectionFactory databaseConnectionFactory, IEnumerable<string>? ignoredTables) {
		this.databaseConnectionFactory = databaseConnectionFactory;
		if(ignoredTables is not null)
			this.ignoredTables = this.ignoredTables.Union(ignoredTables).ToArray();
		using DbConnection connection = databaseConnectionFactory.Create();
		Command = GetCommand(connection, this.ignoredTables);

		static string BuildCommand(IList<string> orderedTables) {
			StringBuilder stringBuilder = new();
			foreach(string table in orderedTables)
				stringBuilder.Append("DELETE FROM ").Append(table).Append(';');
			return stringBuilder.ToString();
		}

		static string GetCommand(DbConnection connection, IEnumerable<string> ignoredTables) {
			var tables = GetTables(connection, ignoredTables);
			var relationships = GetRelationships(connection);
			var orderedTables = OrderTables(tables, relationships);
			return BuildCommand(orderedTables);
		}

		static IList<(string PrimaryKeyTable, string ForeignKeyTable)> GetRelationships(DbConnection connection) {
			var relationships = connection.Query<(string PrimaryKeyTable, string ForeignKeyTable)>("SELECT p.'table', s.name FROM sqlite_schema s JOIN pragma_foreign_key_list(s.name) p ON s.name <> p.'table' WHERE s.type = 'table'");
			return relationships.ToList();
		}

		static IList<string> GetTables(DbConnection connection, IEnumerable<string> ignoredTables) {
			var tables = connection.Query<string>("SELECT name FROM sqlite_schema WHERE type = 'table'");
			return tables.Except(ignoredTables).ToList();
		}

		static IList<string> OrderTables(IList<string> tables, IList<(string PrimaryKeyTable, string ForeignKeyTable)> relationships) {
			List<string> orderedTables = new(tables.Count);
			while(tables.Count > 0) {
				string[] leafs = tables.Except(relationships.Select(r => r.PrimaryKeyTable)).ToArray();
				orderedTables.AddRange(leafs);
				foreach(string leaf in leafs) {
					tables.Remove(leaf);
					foreach(var relationship in relationships.Where(r => r.ForeignKeyTable == leaf).ToArray())
						relationships.Remove(relationship);
				}
			}
			return orderedTables;
		}
	}

	public string Command { get; }

	public void Clear() {
		if(string.IsNullOrEmpty(Command))
			return;
		using DbConnection connection = databaseConnectionFactory.Create();
		connection.Execute(Command);
	}

}