feat: add cassette position for physical cartridge ordering

Add position column to cassettes table (migration v5→v6) so cassettes
are ordered by physical cartridge number instead of denomination.
Update BATM3 preset to $20/$1 denominations with 400-bill capacity.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/machine/electron/main.ts

@@ -516,8 +516,8 @@ app.whenReady().then(() => {
         ],
         gaia: [{ denomination: 20, count: 50 }],
         batm3: [
-          { denomination: 20, count: 500 },
-          { denomination: 50, count: 500 },
+          { denomination: 20, count: 400 },
+          { denomination: 1, count: 400 },
         ],
       }
       seedCassettes = presets[model] || []

apps/machine/electron/state-store.ts

@@ -15,7 +15,7 @@ import fs from 'node:fs'
 
 let db: Database.Database | null = null
 
-const SCHEMA_VERSION = '5'
+const SCHEMA_VERSION = '6'
 
 function getDbPath(): string {
   const prodDir = '/var/lib/lamassu-atm'
@@ -53,7 +53,8 @@ export function initDatabase(dbPath?: string): void {
 
     CREATE TABLE IF NOT EXISTS cassettes (
       denomination INTEGER PRIMARY KEY,
-      count INTEGER NOT NULL DEFAULT 0
+      count INTEGER NOT NULL DEFAULT 0,
+      position INTEGER NOT NULL DEFAULT 0
     );
 
     CREATE TABLE IF NOT EXISTS cashbox (
@@ -198,6 +199,22 @@ export function initDatabase(dbPath?: string): void {
     console.log(
       '[StateStore] Migrated schema v4 → v5 (added manual_dispense type, remediated_by, operator_commands)'
     )
+    existing.value = '5'
+  }
+
+  if (existing && existing.value === '5') {
+    // Migration v5 → v6: add position column to cassettes for physical cartridge ordering
+    db.exec(`ALTER TABLE cassettes ADD COLUMN position INTEGER NOT NULL DEFAULT 0`)
+    // Backfill position from existing row order (by denomination)
+    const rows = db.prepare('SELECT denomination FROM cassettes ORDER BY denomination').all() as {
+      denomination: number
+    }[]
+    const update = db.prepare('UPDATE cassettes SET position = ? WHERE denomination = ?')
+    for (let i = 0; i < rows.length; i++) {
+      update.run(i + 1, rows[i]!.denomination)
+    }
+    db.prepare('UPDATE meta SET value = ? WHERE key = ?').run('6', 'schema_version')
+    console.log('[StateStore] Migrated schema v5 → v6 (added cassette position)')
   }
 
   const cashboxRow = db.prepare('SELECT id FROM cashbox WHERE id = 1').get()
@@ -215,30 +232,36 @@ export function initDatabase(dbPath?: string): void {
 export interface CassetteRow {
   denomination: number
   count: number
+  position: number
 }
 
 export function loadCassettes(): CassetteRow[] {
   if (!db) throw new Error('Database not initialized')
   return db
-    .prepare('SELECT denomination, count FROM cassettes ORDER BY denomination')
+    .prepare('SELECT denomination, count, position FROM cassettes ORDER BY position, denomination')
     .all() as CassetteRow[]
 }
 
 /**
  * Upsert cassette counts. Replaces all existing rows.
  */
-export function setCassettes(cassettes: CassetteRow[]): void {
+export function setCassettes(
+  cassettes: { denomination: number; count: number; position?: number }[]
+): void {
   if (!db) throw new Error('Database not initialized')
 
   const upsert = db.prepare(
-    'INSERT INTO cassettes (denomination, count) VALUES (?, ?) ON CONFLICT(denomination) DO UPDATE SET count = excluded.count'
+    'INSERT INTO cassettes (denomination, count, position) VALUES (?, ?, ?) ON CONFLICT(denomination) DO UPDATE SET count = excluded.count, position = excluded.position'
   )
 
-  const run = db.transaction((rows: CassetteRow[]) => {
-    for (const row of rows) {
-      upsert.run(row.denomination, row.count)
+  const run = db.transaction(
+    (rows: { denomination: number; count: number; position?: number }[]) => {
+      for (let i = 0; i < rows.length; i++) {
+        const row = rows[i]!
+        upsert.run(row.denomination, row.count, row.position ?? i + 1)
+      }
     }
-  })
+  )
 
   run(cassettes)
   console.log('[StateStore] Cassettes updated:', cassettes)

apps/machine/src/config/device.ts

@@ -145,8 +145,8 @@ export const MACHINE_PRESETS: Record<MachineModel, Omit<DeviceConfig, 'fiatCode'
       type: 'f56',
       device: '/dev/ttyUSB0',
       cassettes: [
-        { denomination: 20, count: 500 },
-        { denomination: 50, count: 500 },
+        { denomination: 20, count: 400 },
+        { denomination: 1, count: 400 },
       ],
     },
   },