Markers in DB?

I'm trying to figure out where in the PostgreSQL database
Markers (on timelines) are stored.
I can't find them in any of the tables.

By dumping the database into a file and using greb on that file, I now know that the text of markers is not stored as some varchar column in some table.
But why whould anyone store markers in some kind of binary blob?

Okay, the table public."BtLockableBlob" has a binary LOB field "FieldsBlob".
Somewhere in that BLOB the text of my test-markers is contained in UTF8 or ASCII encoding.
(I only used ASCII characters, so it would have the same binary representation.)