firewalldb: remove unnecessary SQL query executions

As the privacy mapper SQL table defines constraints that ensure no
duplicate real nor pseudo values can be set for the same session group,
we can remove two query executions that were previously used to check
that uniqueness manually before inserting a new privacy pair.

Author: ViktorT-11

firewalldb/privacy_mapper_sql.go

@@ -55,26 +55,6 @@ func (p *privacyMapSQLTx) NewPair(ctx context.Context, real,
 		return err
 	}
 
-	_, err = p.queries.GetPseudoForReal(ctx, sqlc.GetPseudoForRealParams{
-		GroupID: groupID,
-		RealVal: real,
-	})
-	if err == nil {
-		return ErrDuplicateRealValue
-	} else if !errors.Is(err, sql.ErrNoRows) {
-		return err
-	}
-
-	_, err = p.queries.GetRealForPseudo(ctx, sqlc.GetRealForPseudoParams{
-		GroupID:   groupID,
-		PseudoVal: pseudo,
-	})
-	if err == nil {
-		return ErrDuplicatePseudoValue
-	} else if !errors.Is(err, sql.ErrNoRows) {
-		return err
-	}
-
 	return p.queries.InsertPrivacyPair(ctx, sqlc.InsertPrivacyPairParams{
 		GroupID:   groupID,
 		RealVal:   real,