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Juan José Mata
157daf5176
* Document instruction inventory and preservation decisions Trace main history from September 2025 through September 2026, including earlier policy origins. Record preserved requirements, detailed-guide destinations, stale facts, harness boundaries and explicit policy-strength decisions before consolidating instruction sources. * Consolidate repository instructions into shared guidance Keep AGENTS concise and vendor neutral, move detailed conventions into shared guides, and use thin adapters with preserved Cursor scopes. Preserve the strict pre-PR checks globally and document the stronger scope, retired migration pin and rule-generation trigger. Update existing API guidance verification without changing application behavior. * Narrow the always-on Cursor UI adapter and correct the SimpleFIN comment Split the design-system guidance out of docs/llm-guides/ui.md into docs/llm-guides/design-system.md. The ui-ux-design-guidelines rule is alwaysApply: true, so importing all of ui.md loaded the Stimulus, localization and ViewComponent guidance (previously confined to scoped rules) on every Cursor session; the always-on adapter now imports only the design-system guide, matching the scope it had before the consolidation. view_conventions and stimulus_conventions keep the full UI guide. Also correct the stale Provider::Simplefin header comment: pending inclusion defaults on and is resolved by the importer (explicit argument, then SIMPLEFIN_INCLUDE_PENDING, then Setting.syncs_include_pending); the previous comment described the flag as default-off. * Read guidance files as UTF-8 in the API consistency validators The frontmatter regex match ran against content read with the locale default external encoding; the Cursor rule's description contains an em dash, so under US-ASCII (LC_ALL=C) Regexp#match raised ArgumentError, breaking the standalone no-Rails fallback the docs point contributors to. Read all checked files with an explicit UTF-8 encoding in both the standalone script and the Rails test.
145 lines
8.6 KiB
Markdown
145 lines
8.6 KiB
Markdown
# Architecture and development conventions
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Read the relevant models and [schema](../../db/schema.rb) before changing domain
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behavior. The application supports `managed` and `self_hosted` modes through
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`Rails.application.config.app_mode`; see [application configuration](../../config/application.rb).
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Provider availability can differ between installations.
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## Design conventions
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- Push built-in Rails functionality before adding dependencies. A new dependency
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needs a strong technical or business reason; favor established, reliable tools.
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- Keep controllers thin and business logic in `app/models/`, organized with POROs
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and concerns rather than introducing service-object directories. A concern may
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serve one model, but organize it around a model trait rather than merely moving
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code elsewhere. Prefer `account.balance_series` to `AccountSeries.new(account).call`.
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- Optimize for clear object design and readability. Focus performance work on
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critical paths and shared surfaces: avoid N+1 queries and loading large payloads
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in global layouts; use indexes, eager loading, background jobs and caching where
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they address a real cost.
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- Put simple constraints such as null checks and uniqueness in the database.
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ActiveRecord may mirror them for form error handling; prefer client-side form
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validation where possible. Keep complex validation and business logic in Ruby.
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- Use semantic HTML and Hotwire, server-side formatting and URL state. Detailed
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component, Turbo, Stimulus and design-system rules are in [UI guidance](ui.md).
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## Families, users and currencies
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[Family](../../app/models/family.rb) owns financial accounts, users, subscriptions
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and many preferences. [User](../../app/models/user.rb) belongs to a family;
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[Session](../../app/models/session.rb) belongs to a user. Roles include guest,
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member, admin and super admin. Accounts also have an optional user owner and
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sharing rules, so family membership alone does not describe every user's access.
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Use [Current.user and Current.family](../../app/models/current.rb), and the existing
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account-access scopes for the surface being changed.
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An [Account](../../app/models/account.rb) has its own balance and currency.
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[Entries](../../app/models/entry.rb), [balances](../../app/models/balance.rb) and
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[holdings](../../app/models/holding.rb) also retain currencies. The family's
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preferred currency is used to normalize reports; it does not mean every stored
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amount is already in that currency. [Money](../../lib/money.rb) handles monetary
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operations and formatting, with [ExchangeRate](../../app/models/exchange_rate.rb)
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and its [Provided concern](../../app/models/exchange_rate/provided.rb) supplying
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dated conversion rates.
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## Accounts, balances and entries
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Account uses a delegated `accountable` type. The supported types are defined in
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[Accountable](../../app/models/concerns/accountable.rb): asset types `Depository`,
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`Investment`, `Crypto`, `Property`, `Vehicle`, `OtherAsset`; liability types
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`CreditCard`, `Loan`, `OtherLiability`.
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A daily balance records what an asset is worth or what is owed on a liability.
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For a depository account this is cash; for an investment account it includes cash
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and holdings value. A holding records an account's quantity and price of a
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[Security](../../app/models/security.rb) on a date. [Balance::Materializer](../../app/models/balance/materializer.rb)
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materializes holdings through [Holding::Materializer](../../app/models/holding/materializer.rb)
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before calculating balance history.
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Entry delegates to one of the three [Entryable types](../../app/models/entryable.rb),
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with a date, amount and currency:
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- [Valuation](../../app/models/valuation.rb) is an absolute account value or debt
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at a date, not an income or expense.
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- [Transaction](../../app/models/transaction.rb) changes the account balance and
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can have a category, merchant and tags; rules can enrich or classify it.
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- [Trade](../../app/models/trade.rb) represents a security movement with quantity
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and price, including buys and sells.
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For cash movements, **negative entry amounts are inflows; positive amounts are
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outflows**. A negative checking transaction increases cash; a negative credit-card
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transaction is a payment that reduces debt. A sale's negative entry amount
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increases investment-account cash. Do not apply movement signs to an absolute
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valuation or confuse cash direction with asset/liability balance direction.
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## Transfers
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[Transfer](../../app/models/transfer.rb) pairs an inflow and outflow transaction
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between different accounts in the same family. Same-currency amounts must be equal
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and opposite. [Family::AutoTransferMatchable](../../app/models/family/auto_transfer_matchable.rb)
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normally searches a four-day window and also supports cross-currency candidates
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using dated exchange rates and a tolerance. Confirmed transfers permit a
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thirty-day date difference; do not assume every transfer is a same-currency,
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four-day match.
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The destination determines the outflow's kind: loan payment, credit-card payment,
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investment contribution or ordinary funds movement. In [Transaction's budget
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classification](../../app/models/transaction.rb), funds movement and credit-card
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payments are excluded, while loan payments and investment contributions count as
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expenses. Preserve these distinctions rather than treating every transfer as
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excluded from income/expense reporting.
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## Ingestion and background work
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Provider connections such as [PlaidItem](../../app/models/plaid_item.rb) hold
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connection metadata and provider account payloads; processors normalize them into
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internal accounts and entries through [Account::ProviderImportAdapter](../../app/models/account/provider_import_adapter.rb).
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[AccountProvider](../../app/models/account_provider.rb) connects accounts to
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provider records. [Import](../../app/models/import.rb) supports manual import
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sessions, including CSV mapping and transformations. Plaid is one of many supported
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provider integrations.
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[Syncable](../../app/models/concerns/syncable.rb) schedules background syncs and
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[Sync](../../app/models/sync.rb) records their state, hierarchy and errors.
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[Account::Syncer](../../app/models/account/syncer.rb) imports market data,
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materializes history (reverse for linked accounts, forward for manual accounts),
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applies provider balance overrides and matches transfers after sync.
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[Family::Syncer](../../app/models/family/syncer.rb) schedules all eligible Syncable
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`*_items` associations plus manual accounts, then matches transfers and applies
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active rules. Entry-changing workflows call `Entry#sync_account_later`; inspect
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the calling workflow rather than assuming every save schedules a full sync.
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[AutoSync](../../app/controllers/concerns/auto_sync.rb) can request a family sync
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on login once per date when the family enables it and has active accounts.
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[AutoSyncScheduler](../../app/services/auto_sync_scheduler.rb) and the
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[Sidekiq schedule](../../config/schedule.yml) handle scheduled work. Sidekiq also
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runs [SyncJob](../../app/jobs/sync_job.rb), [ImportJob](../../app/jobs/import_job.rb)
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and [AssistantResponseJob](../../app/jobs/assistant_response_job.rb).
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## Provider interfaces and APIs
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Interchangeable provider concepts are registered at runtime through
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[Provider::Registry](../../app/models/provider/registry.rb) and
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[Setting](../../app/models/setting.rb), with environment overrides where supported.
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Interfaces live in `app/models/provider/*_concept.rb`, including
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[SecurityConcept](../../app/models/provider/security_concept.rb) and
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[ExchangeRateConcept](../../app/models/provider/exchange_rate_concept.rb).
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One-off integrations can expose concrete methods without inventing a shared
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concept. Domain models should normally select providers through their `Provided`
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concerns rather than calling the registry throughout business logic.
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Concept providers inherit from [Provider](../../app/models/provider.rb) and use
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`with_provider_response` to return `Provider::Response` (`success?`, `data`,
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`error`). Raise when valid data cannot be produced inside that wrapper; it
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converts failures into the response contract. See [provider guidance](providers.md)
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and [adding a securities provider](adding-a-securities-provider.md) for details.
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Web interaction uses Turbo/Stimulus with server-rendered views. External
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`/api/v1` endpoints support separate Doorkeeper OAuth and `X-Api-Key`
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authentication; API keys are opaque keys, not JWTs. The [API base controller](../../app/controllers/api/v1/base_controller.rb)
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sets current context, skips session CSRF checks and applies API-key rate limits.
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Preserve the existing authentication, scope and strong-parameter behavior. Follow
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the [API consistency guide](api-endpoint-consistency.md) for behavioral tests and
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documentation-only rswag specs; its API-key convention does not remove runtime
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OAuth support.
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