/usr/share/gforge/db/20090402-forum-attachment-types.sql is in gforge-db-postgresql 5.3.2+20141104-3+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ALTER TABLE forum_attachment ADD COLUMN mimetype CHARACTER VARYING(32) DEFAULT 'application/octet-stream';
ALTER TABLE forum_pending_attachment ADD COLUMN mimetype CHARACTER VARYING(32) DEFAULT 'application/octet-stream';
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