feat(validations): merchant (bar/lavazh) ticket validations end-to-end

In-park merchants discharge customers' parking: a merchant user scans the
ticket on their device (/validate; validation:create + program↔user binding)
and applies their program — comp / first-N-minutes free / amount-off (capped,
typed at scan) / percent. All money stays at the booth: the quote folds live
validations in a canonical order (timeCredit → percent → fixed → comp, net
floors at 0, Σ lines ≡ gross − net), the payment records gross/discount and
CONSUMES the validation ids (an overstay's fresh period never re-applies
them), the receipt prints the gross → lines → net story, and the Z/X-report
carries discountTotalMinor leakage. Every apply/void is a signed, attributed
ledger event (refId = append-only void); program config is /setup/site master
data (Bar/Lavazh checkboxes + right-column panel, tabs when both) whose saves
sign config_change. Migration 0024 + reset-db drift-guard entries; 8 route
integration tests + priceSession fold suite.

See wiki/concepts/validation-discounts.md for the full design record.

Claude-Session: https://claude.ai/code/session_01YYkpEsLmoQPaize5ec3oUm

packages/db/src/schema.ts

@@ -458,6 +458,57 @@ export const subscriptionPlates = sqliteTable("subscription_plates", {
   plate: text("plate").notNull(),
 });
 
+// --- Merchant validation programs (bar / lavazh) --------------------------
+// Admin-composed master data for in-park merchant discounts: the /setup/site
+// checkboxes toggle the WELL-KNOWN rows ("bar", "lavazh") — a future merchant is a
+// new row, not a migration. Config is plainly MUTABLE (no versioning): the applied
+// validation is a signed ledger event carrying the RESOLVED values, so historical
+// reproducibility never depends on this row. Enabling/saving signs a config_change.
+// See wiki/concepts/validation-discounts.md.
+export const validationPrograms = sqliteTable("validation_programs", {
+  // Well-known slug ("bar" | "lavazh"); generic text so future merchants are rows.
+  id: text("id").primaryKey(),
+  // Receipt label printed on the booth settlement line (e.g. "Lavazh — 1 orë falas").
+  name: text("name").notNull(),
+  // How the program discounts — see @parking/shared ValidationMode.
+  mode: text("mode", { enum: ["comp", "timeCredit", "fixed", "percent"] })
+    .notNull()
+    .default("comp"),
+  // timeCredit: the free minutes.
+  minutes: integer("minutes"),
+  // percent: 1..100 off the fee.
+  percent: integer("percent"),
+  // fixed: cap on the amount the merchant may type at scan time (minor units).
+  maxAmountMinor: integer("max_amount_minor"),
+  // Anti-abuse cap: max applications per local day (null = unlimited).
+  maxPerDay: integer("max_per_day"),
+  // The /setup/site checkbox. Inactive = merchants can't apply it (row + history kept).
+  active: integer("active", { mode: "boolean" }).notNull().default(false),
+  createdAt: text("created_at")
+    .notNull()
+    .default(sql`(current_timestamp)`),
+  // Soft delete (recycle bin) — see roles.deletedAt.
+  deletedAt: text("deleted_at"),
+  deletedBy: text("deleted_by"),
+});
+
+// The program↔user binding: WHICH users may apply a program (the guard is
+// `validation:create` AND a binding row — a bar user can never apply lavazh).
+export const validationProgramUsers = sqliteTable(
+  "validation_program_users",
+  {
+    programId: text("program_id")
+      .notNull()
+      .references(() => validationPrograms.id),
+    userId: text("user_id")
+      .notNull()
+      .references(() => users.id),
+  },
+  (t) => ({
+    uniq: unique().on(t.programId, t.userId),
+  }),
+);
+
 // --- Blocklist (banlist) -------------------------------------------------
 // Plates/cards refused at ENTRY (never at exit — never trap a vehicle). A hit appends
 // a signed anomaly/refused-entry ledger event. See wiki/entities/blocklist.md.
@@ -546,5 +597,7 @@ export type SubscriptionPlanRow = typeof subscriptionPlans.$inferSelect;
 export type SubscriptionCredentialRow = typeof subscriptionCredentials.$inferSelect;
 export type SubscriptionPlateRow = typeof subscriptionPlates.$inferSelect;
 export type BlocklistRow = typeof blocklist.$inferSelect;
+export type ValidationProgramRow = typeof validationPrograms.$inferSelect;
+export type ValidationProgramUserRow = typeof validationProgramUsers.$inferSelect;
 export type SessionRow = typeof sessions.$inferSelect;
 export type AppLogRow = typeof appLogs.$inferSelect;