feat(git-provider): Initial git registration storage in database

- update PostBuild.ps1 to not delete data directory created during debug
- move sqlite-net-pcl to ModuleCore

src/ModuleCore/Database/DatabaseManager.cs

@@ -1,4 +1,6 @@
-namespace ModuleCore.Database;
+using SQLite;
+
+namespace ModuleCore.Database;
 
 public class DatabaseManager
 {
@@ -16,8 +18,37 @@ public class DatabaseManager
 		_databaseLocation = new FileInfo(Path.Combine(".", "data", $"{SanitiseFilename(databaseName)}.db"));
 
 		Directory.CreateDirectory(_databaseLocation.DirectoryName!);
-		var file = File.Create(_databaseLocation.FullName);
-		file.Close();
+
+		if (!File.Exists(_databaseLocation.FullName))
+		{
+			var file = File.Create(_databaseLocation.FullName);
+			file.Close();
+		}
+	}
+
+	public void InConnection(Action<SQLiteConnection> dbAction)
+	{
+		using var conn = new SQLiteConnection(_databaseLocation.FullName);
+		dbAction(conn);
+	}
+
+	public T InConnection<T>(Func<SQLiteConnection, T> dbAction)
+	{
+		using var conn = new SQLiteConnection(_databaseLocation.FullName);
+		return dbAction(conn);
+	}
+
+	/// <summary>
+	/// Returns a bool for the given query. Convenience method for <see cref="SQLiteConnection.ExecuteScalar"/>.
+	/// </summary>
+	/// <param name="query">A query starting with SELECT 1, optionally paramaterised with ?</param>
+	/// <param name="args">Parameter values</param>
+	/// <returns></returns>
+	public bool Exists(string query, params object[] args)
+	{
+		using var conn = new SQLiteConnection(_databaseLocation.FullName);
+		var exists = conn.ExecuteScalar<bool?>(query, args);
+		return exists ?? false;
 	}
 
 	/// <summary>