The ir_translations were pretty slow to load, this was mainly caused by
the condition in variable 'find_expr' and the import of po values in the
temporary table.
To improve the load performance, we made two improvement:
1. Insert the row in the temporary table by batch instead of making an
insertion for each record.
2. Replacing the condition in the variable 'find_expr' by partial unique
index. To perform such a thing, we had to separate the type model in
two types, 'model' and 'model_terms' because it wasn't possible to
create a partial unique index on type 'model' because the type was
used for two different use cases. The type model is now used for
fields that have have a value not callable for the attribute
translate, these field can only have one record for the same field,
model, res_id and language. And the type 'model_terms' is used for
the fields callable, because they can have multiple sources for the
same res_id.
We also removed the deprecated types 'report', 'help', 'view', 'field'.
Thanks to @rco-odoo for the improvement of the first point.
Pierre Masereel
7288b4779a