Thanks for the detailed output - at this point this suggests the realm / domain configuration is correctly configured to be working together, we may need to double check that the correct password is being passed to the login module but from the information I have if the correct username is arriving there I would not suspect the wrong password to be arriving there.
Within your security domain configuration you have configured the module to use both a hashAlgorithm and hashEncoding - what is the actual value stored in the password field of that row of the table?
I would suggest that as a next step to at least verify end to end of this call that you remove both the hashAlgorithm and hashEncoding values from the domain configuration and update that row of the table so that the password field contains the plain text value 'admin' - if the call can be verified to that point it will mean that attention can then be focussed on the final settings for the DatabaseLoginModule.