db_ddl.sql is missing `sent_file_name` column — breaks DbTrackingModule when schema is created manually

[ricardopsj]

Environment

• OpenAS2 v4.8.2 (built from source — no binary published in this release)
• Java 21 (OpenJDK)
• H2 embedded (file mode), tcp_server_start="false"
• Debian 13

Issue

config/db_ddl.sql (used to bootstrap the H2 tracking schema) does not include the
SENT_FILE_NAME column that is present in the authoritative DDL Utils schema at
resources/db/openas2-schema.xml.

When DbTrackingModule tries to insert a tracking record after a successful outbound,
it fails because the column is missing in the actual table.

Reproduction

1. Configure DbTrackingModule with tcp_server_start="false" and embedded H2.
2. Initialize the schema using db_ddl.sql via org.h2.tools.RunScript
   (since create_db_table.sh requires ant + TCP 9092, both unavailable in a
   typical hardened deployment).
3. Send any outbound message.
4. DbTrackingModule logs an error trying to write sent_file_name.

Workaround

Add the missing column manually to db_ddl.sql before running it:
ALTER TABLE msg_metadata ADD COLUMN sent_file_name VARCHAR(255);
(or include it in the original CREATE TABLE statement, aligning with
resources/db/openas2-schema.xml).

Suggested fix

Regenerate config/db_ddl.sql from resources/db/openas2-schema.xml so the two
stay in sync; or remove db_ddl.sql from the distro and document the schema
bootstrap to use openas2-schema.xml directly through DDL Utils.

Side note

openas2-schema.xml cannot be used directly with org.h2.tools.RunScript
because it's DDL Utils XML, not plain SQL — users without ant end up using
db_ddl.sql, which is why the missing column matters.