[CWEP002 migration] properly raise exception on (add|drop)_relation_definition for computed relation
Related to #3546717
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^build$
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\~$
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^doc/book/en/apidoc$
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.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/