Count hand-valued assets into the wealth figure

A wealth figure that ignores the house is not a wealth figure. Assets
without a market feed - a house, a car, a private loan - are now added
by hand on the Wealth page with a stated value, a currency and the day
the estimate was made; a negative value records a liability. They are
registry entities in assets.finance like everything else, join the
per-currency totals immediately, and a currency held only in an asset
earns its own line.

internal/domain/domain.go

@@ -171,7 +171,7 @@ func NewDataset() Dataset {
 	return Dataset{Accounts: []Account{}, Categories: []Category{
 		{ID: "cat_expenses", Name: "Expenses", Kind: "expense"}, {ID: ExpenseFallback, Name: "Unclassified", ParentID: "cat_expenses", Kind: "expense"},
 		{ID: "cat_income", Name: "Income", Kind: "income"}, {ID: IncomeFallback, Name: "Unclassified", ParentID: "cat_income", Kind: "income"},
-	}, Tags: []Tag{}, Merchants: []Merchant{}, Instruments: []Instrument{}, Transactions: []Transaction{}}
+	}, Tags: []Tag{}, Merchants: []Merchant{}, Instruments: []Instrument{}, Assets: []Asset{}, Transactions: []Transaction{}}
 }
 
 // InstrumentID derives a stable registry ID from an ISIN so re-importing the
@@ -181,7 +181,7 @@ func InstrumentID(isin string) string {
 	return "ins_" + hex.EncodeToString(sum[:16])
 }
 func Clone(d Dataset) Dataset {
-	c := Dataset{Accounts: append([]Account{}, d.Accounts...), Categories: append([]Category{}, d.Categories...), Tags: append([]Tag{}, d.Tags...), Merchants: append([]Merchant{}, d.Merchants...), Instruments: append([]Instrument{}, d.Instruments...), Transactions: append([]Transaction{}, d.Transactions...)}
+	c := Dataset{Accounts: append([]Account{}, d.Accounts...), Categories: append([]Category{}, d.Categories...), Tags: append([]Tag{}, d.Tags...), Merchants: append([]Merchant{}, d.Merchants...), Instruments: append([]Instrument{}, d.Instruments...), Assets: append([]Asset{}, d.Assets...), Transactions: append([]Transaction{}, d.Transactions...)}
 	for i := range c.Merchants {
 		c.Merchants[i].Aliases = append([]string{}, d.Merchants[i].Aliases...)
 		c.Merchants[i].DefaultTagIDs = append([]string{}, d.Merchants[i].DefaultTagIDs...)
@@ -398,6 +398,22 @@ func Validate(d Dataset) error {
 		isins[v.ISIN] = v.ID
 		instruments[v.ID] = v
 	}
+	for _, v := range d.Assets {
+		if err := register(v.ID, "asset"); err != nil {
+			return err
+		}
+		if !nonblank(v.Name) || !currencyPattern.MatchString(v.Currency) || !validText(v.Kind) {
+			return fmt.Errorf("asset %q: valid UTF-8 name and three-letter uppercase currency required", v.ID)
+		}
+		// A hand-stated value without its day cannot be judged stale, so the
+		// two are recorded together, always.
+		if _, err := v.Value.Minor(); err != nil {
+			return fmt.Errorf("asset %q: %w", v.ID, err)
+		}
+		if !validDate(v.ValuedAt) {
+			return fmt.Errorf("asset %q: invalid valuation date %q", v.ID, v.ValuedAt)
+		}
+	}
 	for _, t := range d.Transactions {
 		f := t.Facts
 		if err := register(f.ID, "transaction"); err != nil {

internal/domain/model.go

@@ -116,6 +116,20 @@ type Instrument struct {
 	QuotedAt string   `json:"quoted_at,omitempty"`
 }
 
+// Asset is a possession valued by hand: a house, a car, anything without a
+// market feed. Value is what the owner states it is worth and ValuedAt the day
+// that estimate was made, so a stale figure is visible rather than silently
+// trusted. A negative value records a liability such as a mortgage.
+type Asset struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+	// Kind is free display text grouping the asset: "Real estate", "Vehicle".
+	Kind     string `json:"kind,omitempty"`
+	Currency string `json:"currency"`
+	Value    Money  `json:"value"`
+	ValuedAt string `json:"valued_at"`
+}
+
 type Facts struct {
 	ID               string `json:"id"`
 	Source           string `json:"source"`
@@ -178,6 +192,7 @@ type Dataset struct {
 	Tags         []Tag         `json:"tags"`
 	Merchants    []Merchant    `json:"merchants"`
 	Instruments  []Instrument  `json:"instruments"`
+	Assets       []Asset       `json:"assets"`
 	Transactions []Transaction `json:"transactions"`
 }