store eSeal metadata in the database

For sealing an eCMR, we need to store the metadata in the database:

We need to seal the ecmr AND some metadata including the personname (Who sealed the document) and a timestamp.

Please store this information in a distinct table in the database, this requires an extension of the liquibase scripts and we need to implement the function in the Service (where the signer function is successful called).

After sealing an ecmr, this information must be saved in the database.