The code is standard.

Config file

Some settings in invenio-local.conf.txt

FUZZY_WORDLIMITS set to

N=2 for authors (not used yet) hardcoded use 1st_author and one of secondary authors.

N=2 for title resulting in
use N+1 longest words out of the original title search,
combine searches for all pairs of N words. Example: N=2 -> 3 words in total: W1 W2 W3.
(title:W1 title:W2) or (title:W1 title:W3) or (title:W2 title:W3)

VALIDATION_RULESETS

by default title is not in the validator, found to be too picky

Validate report number, DOI and authors in lazy mode (i.e. one match yields OK)

Validator for authors is important since the search is only for lastnames.
Only the validator uses firstnames.

If there is a report number or DOI
validate only this field + authors

SEARCH_RESULT_MATCH_LIMIT

set to 40

I.e. if the search gives more than 40 results before the validator, no match is returned

Search queries

the standard author + title query uses all authors (lastname only) and the first 3 words of the title (that are longer than 3 letters, no punktuation, no numbers, not 'with', 'from', 'erratum', 'addendum', 'publisher.s note')

If the new record has a CNUM use cnum.config search for:
arXiv-ID
DOI
1st_author and CNUM
standard author + title query

Default is allauth.config search for:
arXiv-ID
DOI
standard author + title query