JuliaMathias / moolah / 673e14dea0cb10fabe87e03154a7b3190145fb48

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Implement Transaction Wrapper Model and Multi-Currency Support (Issue #16) (#53)

* Implement `UpdateUnderlyingTransfer` module to synchronize transaction updates

Adds the `Moolah.Finance.Changes.UpdateUnderlyingTransfer` module, which defines an Ash Resource Change that ensures low-level `Moolah.Ledger.Transfer` updates correspond with high-level `Transaction` changes. The `change/3` function processes updates only when the `amount` or `date` attributes change, invoking the `update_transfer/1` function to manage the transfer lifecycle. This includes destroying the old transfer and creating a new one, maintaining atomicity to prevent data loss or unbalanced ledgers. The module also introduces helper functions for destroying old transfers and creating new replacement transfers, enhancing the overall transaction management process.

* Add `transactions` table and resource snapshot

Creates the `transactions` table with relevant fields including `id`, `transaction_type`, `amount`, `source_amount`, `description`, `date`, `inserted_at`, `updated_at`, and foreign key references to `ledger_accounts`, `budget_categories`, `life_area_categories`, and `ledger_transfers`.

Also adds a resource snapshot in JSON format to define the attributes and constraints for the `transactions` table, ensuring proper integration with the application.

* Add `destroy` action to `Transfer` resource

Updates the `actions` block in the `Moolah.Ledger.Transfer` module to include the `:destroy` action alongside the existing `:read` action. This change allows for the deletion of transfer records, enhancing the resource's functionality.

* Add `CreateUnderlyingTransfer` module for transaction handling

Creates the `Moolah.Finance.Changes.CreateUnderlyingTransfer` module, which acts as a hook during the `create` decision lifecycle of a `Transaction`. This module translates high-level transaction intents into precise double-entry bookkeeping records for the `Moolah.Ledger` system. It i... (continued)

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