Notify user if txm fails saving transactions

[GabrielMartinezRodriguez]

Linked issues

closes https://linear.app/happychain/issue/HAPPY-249/notify-user-if-txm-fails-saving-a-transaction

Description

Added support for transaction save failure notifications through a new hook type. When transactions fail to save, the system now emits a TransactionSaveFailed hook instead of throwing an error. This enables better error handling and allows consumers to react to save failures through hooks.

Key changes:

• Implemented new hook type for transaction save failures
• Modified TransactionCollector to emit events instead of throwing errors

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Checklist

Basics

• B1. I have applied the proper label & proper branch name (e.g. norswap/build-system-caching).
• B2. This PR is not so big that it should be split & addresses only one concern.
• B3. The PR targets the lowest branch it can (ideally master).

Correctness

• C1. Builds and passes tests.

• C2. The code is properly parameterized & compatible with different environments.

• C3. I have manually tested my changes & connected features.

• C4. I have performed a thorough self-review of my code after submitting the PR.

Architecture & Documentation

• D1. I made it easy to reason locally about the code.
• D2. All public-facing APIs & meaningful internal APIs are properly documented.
• D3. If appropriate, the general architecture is documented.

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[GabrielMartinezRodriguez]

• Notify user if txm fails saving transactions #297 👈 (View in Graphite)
• Add flush mechanism #289 : 1 other dependent PR (#298 )
• Allow run multiple txm simultaneously within the same service #285
• Added docs for txm #272
• Mutex in tx monitor #264
• Purge transactions #232
• Txm hooks #229
• Use kysely instead of mikro-orm #250
• master

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[linear]

HAPPY-249 Notify user if txm fails saving a transaction

#250 (comment)