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-# Unit of Work — Refactor Notes
-
-## Current Issues
-
-### 1. Lifetime
-`UnitOfWork` is created once in the handler constructor and reused across every `Handle` call.
-It should be **per-request**, created inside `Handle`.
-
-### 2. Transaction leaks out
-`Begin()` returns `*sql.Tx`, which is then passed manually to each repo constructor.
-The UoW should own that wiring — callers should never touch the transaction directly.
-
-### 3. Eager instantiation (rejected solution)
-Having UoW create all repos in `Begin()` solves the leaking transaction, but forces every handler
-to pay for repos it doesn't need. Not acceptable.
-
----
-
-## Solution: Lazy Initialization
-
-UoW exposes accessor methods that initialize each repo on first access, wired to the internal transaction.
-Unused repos are never instantiated.
-
-```go
-type UnitOfWork struct {
-    FileStore *store.FileStore
-    tx        *sql.Tx
-    tags      ITagRepository
-    notes     INoteRepository
-}
-
-func NewUnitOfWork() *UnitOfWork {
-    return &UnitOfWork{FileStore: store.NewFileStore()}
-}
-
-func (u *UnitOfWork) Begin() error {
-    tx, err := persistence.GetDBContext().DB.Begin()
-    if err != nil {
-        return err
-    }
-    u.tx = tx
-    return nil
-}
-
-func (u *UnitOfWork) Tags() ITagRepository {
-    if u.tags == nil {
-        u.tags = NewTagRepository(u.tx)
-    }
-    return u.tags
-}
-
-func (u *UnitOfWork) Notes() INoteRepository {
-    if u.notes == nil {
-        u.notes = NewNoteRepository(u.tx)
-    }
-    return u.notes
-}
-
-func (u *UnitOfWork) Commit() error {
-    if err := u.FileStore.Flush(); err != nil {
-        u.tx.Rollback()
-        u.tx = nil
-        return err
-    }
-    if err := u.tx.Commit(); err != nil {
-        u.FileStore.Rollback()
-        u.tx = nil
-        return err
-    }
-    u.tx = nil
-    return nil
-}
-
-func (u *UnitOfWork) Rollback() {
-    if u.tx == nil {
-        return
-    }
-    u.tx.Rollback()
-    u.FileStore.Rollback()
-    u.tx = nil
-}
-```
-
----
-
-## Usage in a Handler
-
-```go
-func (h *CreateNoteHandler) Handle(ctx context.Context, raw json.RawMessage) (any, error) {
-    var cmd createNoteCommand
-    if err := json.Unmarshal(raw, &cmd); err != nil {
-        return nil, err
-    }
-
-    uow := repositories.NewUnitOfWork()
-    if err := uow.Begin(); err != nil {
-        return nil, err
-    }
-    defer uow.Rollback()
-
-    // Notes() is never called — never instantiated
-    dbTags, err := uow.Tags().GetByNames(ctx, tags)
-    if err != nil {
-        return nil, err
-    }
-
-    // ...
-
-    uow.FileStore.Stage(cmd.Path, data)
-    return cmd.Path, uow.Commit()
-}
-```
-
----
-
-## Properties of This Design
-
-| Property | Result |
-|---|---|
-| Transaction leaks out of UoW | No — `tx` is private |
-| Repos instantiated when not needed | No — lazy on first access |
-| Handler controls which repos it uses | Yes — only accessed repos are created |
-| UoW created per-request | Yes — inside `Handle`, not constructor |
-| Handler has no persistent state | Yes — can be zero-value struct |