[FIX] base: avoid creating a new index at each model initialization

As example, on a runbot database, there are 13 duplicated indexes

```
4362411-14-0-all=> \d res_users_apikeys;
                                         Table "public.res_users_apikeys"
   Column    |            Type             | Collation | Nullable |                    Default
-------------+-----------------------------+-----------+----------+-----------------------------------------------
 id          | integer                     |           | not null | nextval('res_users_apikeys_id_seq'::regclass)
 name        | character varying           |           | not null |
 user_id     | integer                     |           | not null |
 scope       | character varying           |           |          |
 index       | character varying(8)        |           |          |
 key         | character varying           |           |          |
 create_date | timestamp without time zone |           |          | timezone('utc'::text, now())
Indexes:
    "res_users_apikeys_pkey" PRIMARY KEY, btree (id)
    "res_users_apikeys_user_id_index_idx" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx1" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx10" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx11" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx12" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx2" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx3" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx4" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx5" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx6" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx7" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx8" btree (user_id, index)
    "res_users_apikeys_user_id_index_idx9" btree (user_id, index)
Check constraints:
    "res_users_apikeys_index_check" CHECK (char_length(index::text) = 8)
Foreign-key constraints:
    "res_users_apikeys_user_id_fkey" FOREIGN KEY (user_id) REFERENCES res_users(id)
```

closes odoo/odoo#58726

Signed-off-by: Christophe Simonis <chs@odoo.com>

0 files changed, 0 insertions, 0 deletions