Squashed commit of the following:

commit be879b1e
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Thu Jan 30 18:22:44 2025 +0100

    [ngrams] code fixes according to review

    Related MR:
    !378

commit bf89561b
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Wed Jan 22 21:11:47 2025 +0100

    [test] notification on node move

    Also, some small refactorings.

commit 3d5d74ab
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Wed Jan 22 20:13:44 2025 +0100

    [tests] add notifications func comment, fix core/notifications indent

commit b8ea3af2
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Wed Jan 22 19:13:35 2025 +0100

    [update-project-dependencies]

commit 1217baf4
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Wed Jan 22 19:09:17 2025 +0100

    [tests] notifications: test async notifications for update tree

    Related to
    #418

commit 874785e9
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Tue Jan 21 06:06:27 2025 +0100

    [refactor] unify Database & ExternalIDs

    These types are the same, except for Database.Empty

    I managed to have backwards compatibility with the frontend format,
    hence the frontend doesn't need any changes.

commit e7b16520
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Tue Jan 21 06:05:57 2025 +0100

    [cabal] upgrade haskell-bee to fix TSRetry and ESRepeat issues

commit ad045ae0
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Jan 20 06:32:49 2025 +0100

    [cabal] upgrade haskell-bee tag

commit b3910bb4
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Tue Jan 14 10:56:12 2025 +0100

    [test] move some Arbitrary instances to Test/Instances.hs

commit bb282d02
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Tue Jan 14 09:17:23 2025 +0100

    [test] WithQuery offline test (with EPO constructor)

commit c0fe2e51
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Tue Jan 14 06:59:45 2025 +0100

    [query] move EPO user/token into the datafield

    This simplifies the WithQuery structure even more

commit 93586adc
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Jan 13 17:45:42 2025 +0100

    [tests] fix WithQuery frontend serialization test

    Also, add WithQuery pubmed test (with api_key)

commit bc29319c
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Jan 13 10:13:15 2025 +0100

    [ngrams] simplify WithQuery json structure

    There is now only a 'datafield' field, no need for duplicated
    'database'.

    Related to #441

commit e6fdbee4
Merge: 95dc32b3 13457ca8
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Fri Jan 10 12:03:59 2025 +0100

    Merge branch 'dev' into 224-dev-understanding-ngrams

commit 95dc32b3
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Tue Jan 7 20:01:11 2025 +0100

    [ngrams] refactor PubMed DB type (to include Maybe APIKey)

commit baa2491f
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Tue Jan 7 18:09:04 2025 +0100

    [refactor] searx search refactoring

commit fcf83bf7
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Tue Jan 7 11:14:03 2025 +0100

    [ngrams] more types annotations

commit 0d8a77c4
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Dec 30 16:15:07 2024 +0100

    [ngrams, test] refactor: Count -> Terms

commit 85f1dffe
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Dec 30 14:35:05 2024 +0100

    [ngrams] refactor opaque Int into TermsWeight newtype

commit a81ea049
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Dec 30 14:34:39 2024 +0100

    [CLI] fix limit removal

    It wasn't used anyways.

commit d1dfbf79
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Dec 30 11:35:41 2024 +0100

    [ngrams] one more simplification in ngramsByDoc'

commit fcb48b8f
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Dec 30 11:33:33 2024 +0100

    [ngrams] some more simplification of ngramsByDoc'

commit ab7c1766
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Dec 30 11:00:19 2024 +0100

    [ngrams, tests] understanding ngramsByDoc better

commit 35c2d0b0
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Dec 23 21:20:29 2024 +0100

    [ngrams] small simplification to docNgrams function

commit 161ac077
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Mon Dec 23 18:35:59 2024 +0100

    [ngrams] annotate types of ngrams algorithms

commit 08c7c91c
Author: Przemysław Kaminski <pk@intrepidus.pl>
Date:   Sat Dec 21 09:45:00 2024 +0100

    [ngrams] improve function documentation, add types, add unit tests

    I want to understand ngrams algorithms better.