Michael Powers 76743aee48
Fixes #635 - Unique constraint violation when using U2F tokens on PostgreSQL
Because of differences in how .on_conflict() works compared to .replace_into() the PostgreSQL backend wasn't correctly ensuring the unique constraint on user_uuid and atype wasn't getting violated.

This change simply issues a DELETE on the unique constraint prior to the insert to ensure uniqueness. PostgreSQL does not support multiple constraints in ON CONFLICT clauses.
2020-01-13 21:53:57 -05:00
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