iv: wire ventures, venture_legs, and parameter_drift_log (Changes 1+2)

server/index.js

@@ -8,29 +8,82 @@
 //   transparently on first SQLite access if present.
 // Frontend interface unchanged — GET/POST /api/save/:token same as before.
 //
-// Change 3 (OTIVM-IV): background_id from the frontend is now a real
+// Change 1 (OTIVM-IV): on dispatch_start event, create ventures +
-// canonical identifier (e.g. 'former_legionary'). On new player creation,
+//   venture_legs rows. On dispatch_complete, close venture with outcome_net.
-// seed actor_parameters from background_starting_values for that background.
+// Change 2 (OTIVM-IV): on den change, write parameter_drift_log row
-// The previous default of 'unknown' is kept only as a fallback for legacy
+//   (trigger_type = 'venture_complete'). On aut change, write
-// saves that predate Change 3.
+//   parameter_drift_log row (trigger_type = 'interval_complete').
+//
+// Cost split — placeholder pending a proper cost model:
+//   cost_vectura  = 60% of route cost  (VECTVRA — freight charge)
+//   cost_portoria = 25% of route cost  (PORTORIUM — customs duty)
+//   cost_other    = 15% of route cost  (horreum, incidentals)
+// These proportions are fixed constants here, not in the schema.
+// When a real cost model is designed, this is the only place to change.
 
 import Fastify from 'fastify'
 import fastifyStatic from '@fastify/static'
-import { readFile, writeFile, mkdir } from 'fs/promises'
+import { readFile, mkdir } from 'fs/promises'
 import { join, dirname } from 'path'
 import { fileURLToPath } from 'url'
 import { existsSync } from 'fs'
+import { readFileSync } from 'fs'
 import Database from 'better-sqlite3'
 
 const __dirname = dirname(fileURLToPath(import.meta.url))
-const ROOT       = join(__dirname, '..')
+const ROOT        = join(__dirname, '..')
-const DIST       = join(ROOT, 'dist')
+const DIST        = join(ROOT, 'dist')
-const SAVES_DIR  = join(ROOT, 'data', 'saves')
+const SAVES_DIR   = join(ROOT, 'data', 'saves')
-const DB_PATH    = join(ROOT, 'data', 'otivm.sqlite3')
+const DB_PATH     = join(ROOT, 'data', 'otivm.sqlite3')
 const SCHEMA_PATH = join(ROOT, 'data', 'create_player_db.sql')
 
 await mkdir(SAVES_DIR, { recursive: true })
 
+// ── Cost split constants ─────────────────────────────────────────────────────
+// Placeholder proportions — change here only when a real cost model is defined.
+const COST_VECTURA_RATIO  = 0.60
+const COST_PORTORIA_RATIO = 0.25
+// cost_other = remainder (1 - 0.60 - 0.25 = 0.15)
+
+// Route mode classification — used for venture_legs.mode
+// 'olive' and 'wine' are road; 'grain', 'linen' are sea.
+// Extend this map when new routes are added.
+const ROUTE_MODE = {
+  olive:  'road',
+  wine:   'road',
+  grain:  'sea',
+  linen:  'sea',
+}
+
+// Route cargo definitions — used for ventures.cargo_type / cargo_unit
+const ROUTE_CARGO = {
+  olive: { type: 'Olive oil, Garum',         unit: 'amphora' },
+  wine:  { type: 'Campanian wine, Wool',      unit: 'amphora' },
+  grain: { type: 'Adriatic grain, Amber',     unit: 'modius'  },
+  linen: { type: 'Berber linen, Frankincense',unit: 'talent'  },
+}
+
+// Route H3 waypoints — origin and destination res-5 cell IDs
+// Sourced from src/constants.js WAYPOINTS and ROUTES
+const ROUTE_H3 = {
+  olive: { origin: '851e805bfffffff', destination: '851e8333fffffff' },
+  wine:  { origin: '851e8333fffffff', destination: '851e8ba3fffffff' },
+  grain: { origin: '851e8ba3fffffff', destination: '85386e23fffffff' },
+  linen: { origin: '85386e23fffffff', destination: '853f5ba7fffffff' },
+}
+
+// Route cost and profit — sourced from src/constants.js ROUTES
+// Duplicated here so server/index.js has no dependency on frontend constants.
+const ROUTE_ECONOMICS = {
+  olive: { cost: 8,  profit: 12, duration_ms: 6000  },
+  wine:  { cost: 14, profit: 22, duration_ms: 9000  },
+  grain: { cost: 24, profit: 40, duration_ms: 12000 },
+  linen: { cost: 38, profit: 70, duration_ms: 18000 },
+}
+
+// MS_PER_SIM_DAY — must match src/constants.js
+const MS_PER_SIM_DAY = 3_000
+
 // ── TESSERA world database (read-only) ──────────────────────────────────────
 
 const db = new Database(DB_PATH, { readonly: true })
@@ -56,19 +109,9 @@ function h3HexToInt(hexStr) {
 }
 
 // ── Per-player database ──────────────────────────────────────────────────────
-//
-// One SQLite file per player at data/saves/{token}.sqlite3.
-// Created from data/create_player_db.sql on first access.
-// Write-safe: only one process writes to a given file at a time.
-// The better-sqlite3 instance is opened, used, and closed per request —
-// no persistent connection pool needed at 128 concurrent players.
 
-// Read the schema once at startup — better-sqlite3 exec() requires the full SQL string.
-import { readFileSync } from 'fs'
 const PLAYER_SCHEMA_SQL = readFileSync(SCHEMA_PATH, 'utf8')
 
-// Open (or create) the player database for a given token.
-// Returns a better-sqlite3 Database instance — caller must close it.
 function openPlayerDb(token) {
   const path = join(SAVES_DIR, `${token}.sqlite3`)
   const isNew = !existsSync(path)
@@ -76,38 +119,38 @@ function openPlayerDb(token) {
   pdb.pragma('journal_mode = WAL')
   pdb.pragma('foreign_keys = ON')
   if (isNew) {
-    // Run the full schema — idempotent due to IF NOT EXISTS clauses.
     pdb.exec(PLAYER_SCHEMA_SQL)
   }
   return pdb
 }
 
+// ── UUID generator ───────────────────────────────────────────────────────────
+// Simple RFC4122 v4 UUID — no external dependency needed.
+function uuid() {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => {
+    const r = Math.random() * 16 | 0
+    return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16)
+  })
+}
+
 // ── JSON → SQLite migration ──────────────────────────────────────────────────
-//
-// Called once per token when a .json exists but no .sqlite3 exists.
-// Imports the flat JSON game state into the events and actor_parameters
-// tables so the behavioral record is preserved.
-// The JSON file is left in place — never deleted.
 
 function migrateJsonToSqlite(token, pdb, json) {
   const now = new Date().toISOString()
   const actorId = token
   const sessionId = token
 
-  // actor_profile — one row anchoring the actor
   const background = json.background_id || 'unknown'
   const name       = json.actor_name    || 'Mercator'
   const epoch      = 'roman_14bce'
 
-  const insertProfile = pdb.prepare(`
+  pdb.prepare(`
     INSERT OR IGNORE INTO actor_profile
       (actor_id, session_id, background_id, actor_name, epoch, schema_version, recorded_at)
-    VALUES (?, ?, ?, ?, ?, 3, ?)
+    VALUES (?, ?, ?, ?, ?, 5, ?)
-  `)
+  `).run(actorId, sessionId, background, name, epoch, now)
-  insertProfile.run(actorId, sessionId, background, name, epoch, now)
 
-  // Seed actor_parameters from background_starting_values if not already seeded
+  pdb.prepare(`
-  const seedParams = pdb.prepare(`
     INSERT OR IGNORE INTO actor_parameters
       (actor_id, parameter_token, scope, layer,
        value_true, value_perceived, value_social,
@@ -122,43 +165,36 @@ function migrateJsonToSqlite(token, pdb, json) {
       confidence_tag, observable_level, 'migration', ?
     FROM background_starting_values
     WHERE background_id = ?
-  `)
+  `).run(actorId, now, background)
-  seedParams.run(actorId, now, background)
 
-  // Override liquiditas with actual value from JSON if available
   if (json.den !== undefined) {
-    const upsertLiq = pdb.prepare(`
+    pdb.prepare(`
       INSERT INTO actor_parameters
         (actor_id, parameter_token, scope, layer,
          value_true, value_perceived, confidence_tag, observable_level,
          drift_source, recorded_at)
       VALUES (?, 'liquiditas', 'actor', 'roman',
               ?, ?, 'measured', 'full', 'migration', ?)
-    `)
+    `).run(actorId, String(json.den), String(json.den), now)
-    upsertLiq.run(actorId, String(json.den), String(json.den), now)
   }
 
-  // Override auctoritas with actual value from JSON if available
   if (json.aut !== undefined) {
-    const upsertAut = pdb.prepare(`
+    const band = autBand(json.aut)
+    pdb.prepare(`
       INSERT INTO actor_parameters
         (actor_id, parameter_token, scope, layer,
          value_true, value_perceived, value_social,
          confidence_tag, observable_level, drift_source, recorded_at)
       VALUES (?, 'auctoritas', 'actor', 'roman',
               ?, ?, ?, 'indicated', 'partial', 'migration', ?)
-    `)
+    `).run(actorId, band, band, band, now)
-    const band = autBand(json.aut)
-    upsertAut.run(actorId, band, band, band, now)
   }
 
-  // Import legacy events[] array into the events table
   const insertEvent = pdb.prepare(`
     INSERT INTO events (actor_id, event_type, ref_id, ref_type, payload, recorded_at)
     VALUES (?, ?, ?, ?, ?, ?)
   `)
-  const eventsArr = json.events || []
+  for (const ev of (json.events || [])) {
-  for (const ev of eventsArr) {
     insertEvent.run(
       actorId,
       ev.type || 'unknown',
@@ -169,18 +205,13 @@ function migrateJsonToSqlite(token, pdb, json) {
     )
   }
 
-  // Record the migration itself as an event
   insertEvent.run(
-    actorId,
+    actorId, 'session_start', null, null,
-    'session_start',
+    JSON.stringify({ source: 'json_migration', schema_version: 5 }),
-    null,
-    null,
-    JSON.stringify({ source: 'json_migration', schema_version: 3 }),
     now
   )
 }
 
-// Convert raw auctoritas integer (OTIVM-I/II) to ordinal band.
 function autBand(aut) {
   if (aut >= 30) return 'distinguished'
   if (aut >= 15) return 'high'
@@ -188,14 +219,9 @@ function autBand(aut) {
   return 'low'
 }
 
-// ── Read player state from SQLite ────────────────────────────────────────────
+// ── Read player state ────────────────────────────────────────────────────────
-//
-// Returns the current game state as the frontend expects it.
-// Derives the flat JSON shape from the relational records so the
-// frontend requires zero changes.
 
 function readPlayerState(token, pdb) {
-  // Current parameter values — most recent non-superseded row per token
   const params = pdb.prepare(`
     SELECT parameter_token, value_true, value_perceived, value_social,
            confidence_tag, observable_level
@@ -213,7 +239,6 @@ function readPlayerState(token, pdb) {
   const autStr = paramMap['auctoritas']?.value_true || 'low'
   const aut = autToInt(autStr)
 
-  // Events — chronological
   const events = pdb.prepare(`
     SELECT event_type AS type, ref_id AS route_id, payload, recorded_at AS timestamp_utc
     FROM events
@@ -221,7 +246,6 @@ function readPlayerState(token, pdb) {
     ORDER BY recorded_at ASC
   `).all(token)
 
-  // Derive dispatches and route_dispatches from event log
   let dispatches = 0
   const route_dispatches = {}
   const journal_seen = []
@@ -254,13 +278,11 @@ function readPlayerState(token, pdb) {
     }
   }
 
-  // chapter derived from den + aut
   if (aut >= 30 && den >= 800) chapter = 5
   else if (aut >= 15 && den >= 350) chapter = 4
   else if (aut >= 5  && den >= 120) chapter = 3
   else if (den >= 40) chapter = 2
 
-  // actor_profile
   const profile = pdb.prepare(
     'SELECT * FROM actor_profile WHERE actor_id = ? ORDER BY recorded_at DESC LIMIT 1'
   ).get(token)
@@ -282,11 +304,10 @@ function readPlayerState(token, pdb) {
       timestamp_utc: e.timestamp_utc,
     })),
     created_at: profile?.recorded_at || new Date().toISOString(),
-    schema_version: 3,
+    schema_version: 5,
   }
 }
 
-// Convert ordinal band back to a representative integer for chapter logic.
 function autToInt(band) {
   switch (band) {
     case 'distinguished': return 35
@@ -296,19 +317,95 @@ function autToInt(band) {
   }
 }
 
-// ── Write player state to SQLite ─────────────────────────────────────────────
+// ── Venture helpers ──────────────────────────────────────────────────────────
-//
+
-// Receives the flat JSON game state from the frontend.
+// Find the open (active) venture for this actor, if any.
-// Writes parameter changes as new actor_parameters rows (append-only).
+function findActiveVenture(pdb, actorId) {
-// Appends new events to the events table.
+  return pdb.prepare(`
-// Marks superseded parameter rows.
+    SELECT venture_id, venture_label FROM ventures
-//
+    WHERE actor_id = ? AND status = 'active'
-// On new player creation (no actor_profile row yet):
+    ORDER BY recorded_at DESC LIMIT 1
-//   - Uses background_id from the request body (sent by frontend after
+  `).get(actorId)
-//     player chooses on the Prologue tab).
+}
-//   - Seeds actor_parameters from background_starting_values for that background.
+
-//   - Sets liquiditas to the background's starting_den value from the body.
+// Create a venture + venture_leg row on dispatch_start.
-//   - Falls back to 'unknown' only if no background_id is present (legacy saves).
+// Returns the new venture_id.
+function createVenture(pdb, actorId, routeId, now) {
+  const eco   = ROUTE_ECONOMICS[routeId]
+  const cargo = ROUTE_CARGO[routeId]
+  const h3    = ROUTE_H3[routeId]
+  const mode  = ROUTE_MODE[routeId] || 'road'
+
+  if (!eco || !cargo || !h3) return null  // unknown route — skip silently
+
+  const ventureId = uuid()
+  const legId     = uuid()
+
+  const costVectura  = Math.round(eco.cost * COST_VECTURA_RATIO  * 100) / 100
+  const costPortoria = Math.round(eco.cost * COST_PORTORIA_RATIO * 100) / 100
+  const costOther    = Math.round((eco.cost - costVectura - costPortoria) * 100) / 100
+  const durationDays = Math.round(eco.duration_ms / MS_PER_SIM_DAY)  // INTEGER
+
+  const label = `${routeId.charAt(0).toUpperCase() + routeId.slice(1)} route`
+
+  pdb.prepare(`
+    INSERT INTO ventures
+      (venture_id, actor_id, venture_label, status,
+       cargo_type, cargo_unit, cost_total,
+       recorded_at, started_at)
+    VALUES (?, ?, ?, 'active', ?, ?, ?, ?, ?)
+  `).run(ventureId, actorId, label, cargo.type, cargo.unit,
+         eco.cost, now, now)
+
+  pdb.prepare(`
+    INSERT INTO venture_legs
+      (leg_id, venture_id, leg_sequence,
+       origin_h3, destination_h3, mode,
+       duration_days, cost_vectura, cost_portoria, cost_other, cost_total,
+       status, recorded_at, started_at)
+    VALUES (?, ?, 1, ?, ?, ?, ?, ?, ?, ?, ?, 'active', ?, ?)
+  `).run(legId, ventureId, h3.origin, h3.destination, mode,
+         durationDays, costVectura, costPortoria, costOther, eco.cost,
+         now, now)
+
+  return ventureId
+}
+
+// Close the active venture on dispatch_complete.
+// Writes outcome_net, completed_at, and closes the leg.
+function closeVenture(pdb, actorId, routeId, ventureId, now) {
+  const eco = ROUTE_ECONOMICS[routeId]
+  if (!eco) return
+
+  const outcomeNet = eco.profit - eco.cost
+
+  pdb.prepare(`
+    UPDATE ventures
+    SET status = 'complete', revenue_total = ?, outcome_net = ?, completed_at = ?
+    WHERE venture_id = ?
+  `).run(eco.profit, outcomeNet, now, ventureId)
+
+  pdb.prepare(`
+    UPDATE venture_legs
+    SET status = 'complete', completed_at = ?
+    WHERE venture_id = ? AND status = 'active'
+  `).run(now, ventureId)
+}
+
+// ── Drift log helpers ────────────────────────────────────────────────────────
+
+function writeDriftLog(pdb, actorId, paramToken, triggerType, triggerRef,
+                       valueBefore, valueAfter, deltaNote, now) {
+  pdb.prepare(`
+    INSERT INTO parameter_drift_log
+      (actor_id, parameter_token, trigger_type, trigger_ref,
+       value_before, value_after, delta_note, recorded_at)
+    VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+  `).run(actorId, paramToken, triggerType, triggerRef,
+         String(valueBefore), String(valueAfter), deltaNote, now)
+}
+
+// ── Write player state ───────────────────────────────────────────────────────
 
 function writePlayerState(token, pdb, body) {
   const now = new Date().toISOString()
@@ -320,19 +417,15 @@ function writePlayerState(token, pdb, body) {
   ).get(actorId)
 
   if (!profile) {
-    // New player — use the background_id sent by the frontend.
-    // The Prologue tab ensures this is a canonical identifier before sending.
     const backgroundId = body.background_id || 'unknown'
     const actorName    = body.actor_name    || 'Mercator'
 
     pdb.prepare(`
       INSERT OR IGNORE INTO actor_profile
         (actor_id, session_id, background_id, actor_name, epoch, schema_version, recorded_at)
-      VALUES (?, ?, ?, ?, 'roman_14bce', 4, ?)
+      VALUES (?, ?, ?, ?, 'roman_14bce', 5, ?)
     `).run(actorId, actorId, backgroundId, actorName, now)
 
-    // Seed all parameters from background_starting_values for chosen background.
-    // auctoritas gets value_social seeded from the same row's value_true.
     pdb.prepare(`
       INSERT OR IGNORE INTO actor_parameters
         (actor_id, parameter_token, scope, layer,
@@ -351,17 +444,12 @@ function writePlayerState(token, pdb, body) {
       WHERE background_id = ?
     `).run(actorId, now, backgroundId)
 
-    // Override liquiditas with the den value from the body (which was set
-    // from BACKGROUNDS[x].starting_den on the frontend). This is the
-    // authoritative starting value — the seed row is superseded immediately.
     if (body.den !== undefined) {
-      // Supersede the seed row
       pdb.prepare(`
         UPDATE actor_parameters
         SET superseded_at = ?
         WHERE actor_id = ? AND parameter_token = 'liquiditas' AND superseded_at IS NULL
       `).run(now, actorId)
-      // Insert the confirmed starting value
       pdb.prepare(`
         INSERT INTO actor_parameters
           (actor_id, parameter_token, scope, layer,
@@ -373,18 +461,23 @@ function writePlayerState(token, pdb, body) {
     }
   }
 
-  // Update liquiditas if den changed
+  // Read current den/aut before any update — needed for drift log
-  if (body.den !== undefined) {
+  const currentLiq = pdb.prepare(`
-    updateParam(pdb, actorId, 'liquiditas', String(body.den), String(body.den), now)
+    SELECT value_true FROM actor_parameters
-  }
+    WHERE actor_id = ? AND parameter_token = 'liquiditas' AND superseded_at IS NULL
+    ORDER BY recorded_at DESC LIMIT 1
+  `).get(actorId)
+  const currentAut = pdb.prepare(`
+    SELECT value_true FROM actor_parameters
+    WHERE actor_id = ? AND parameter_token = 'auctoritas' AND superseded_at IS NULL
+    ORDER BY recorded_at DESC LIMIT 1
+  `).get(actorId)
 
-  // Update auctoritas if aut changed
+  const prevDen = currentLiq?.value_true ?? '0'
-  if (body.aut !== undefined) {
+  const prevAut = currentAut?.value_true ?? 'low'
-    const band = autBand(body.aut)
+
-    updateParamWithSocial(pdb, actorId, 'auctoritas', band, band, band, now)
+  // ── Process new events (Change 1 + Change 2) ─────────────────────────────
-  }
 
-  // Append new events — only those not already recorded
   const lastRecorded = pdb.prepare(`
     SELECT recorded_at FROM events
     WHERE actor_id = ?
@@ -399,20 +492,93 @@ function writePlayerState(token, pdb, body) {
 
   for (const ev of (body.events || [])) {
     const ts = ev.timestamp_utc || now
-    if (ts > lastTs) {
+    if (ts <= lastTs) continue
+
+    const routeId = ev.route_id || null
+
+    // Change 1 — venture creation on dispatch_start
+    if (ev.type === 'dispatch_start' && routeId) {
+      const ventureId = createVenture(pdb, actorId, routeId, ts)
       insertEvent.run(
-        actorId,
+        actorId, ev.type, routeId, 'venture',
-        ev.type || 'unknown',
+        JSON.stringify({ ...ev, venture_id: ventureId }),
-        ev.route_id || null,
-        ev.route_id ? 'venture' : null,
-        JSON.stringify(ev),
         ts
       )
+      continue
+    }
+
+    // Change 1 — venture closure on dispatch_complete
+    if (ev.type === 'dispatch_complete' && routeId) {
+      const active = findActiveVenture(pdb, actorId)
+      if (active) {
+        closeVenture(pdb, actorId, routeId, active.venture_id, ts)
+        insertEvent.run(
+          actorId, ev.type, routeId, 'venture',
+          JSON.stringify({ ...ev, venture_id: active.venture_id }),
+          ts
+        )
+      } else {
+        insertEvent.run(
+          actorId, ev.type, routeId, 'venture',
+          JSON.stringify(ev), ts
+        )
+      }
+      continue
+    }
+
+    // All other events — write as-is
+    insertEvent.run(
+      actorId,
+      ev.type || 'unknown',
+      routeId,
+      routeId ? 'venture' : null,
+      JSON.stringify(ev),
+      ts
+    )
+  }
+
+  // ── Update parameters + drift log (Change 2) ─────────────────────────────
+
+  if (body.den !== undefined) {
+    const newDen = String(body.den)
+    if (newDen !== prevDen) {
+      // Find the venture that just completed, if any — use as trigger_ref
+      const lastVenture = pdb.prepare(`
+        SELECT venture_id, venture_label FROM ventures
+        WHERE actor_id = ? AND status = 'complete'
+        ORDER BY completed_at DESC LIMIT 1
+      `).get(actorId)
+
+      updateParam(pdb, actorId, 'liquiditas', newDen, newDen, now)
+
+      writeDriftLog(
+        pdb, actorId, 'liquiditas',
+        'venture_complete',
+        lastVenture?.venture_id || null,
+        prevDen, newDen,
+        lastVenture?.venture_label || null,
+        now
+      )
+    }
+  }
+
+  if (body.aut !== undefined) {
+    const newBand = autBand(body.aut)
+    if (newBand !== prevAut) {
+      updateParamWithSocial(pdb, actorId, 'auctoritas', newBand, newBand, newBand, now)
+
+      writeDriftLog(
+        pdb, actorId, 'auctoritas',
+        'interval_complete',
+        null,
+        prevAut, newBand,
+        'otium rest',
+        now
+      )
     }
   }
 }
 
-// Append a new actor_parameters row and supersede the previous one.
 function updateParam(pdb, actorId, token, valueTrue, valuePerceived, now) {
   pdb.prepare(`
     UPDATE actor_parameters
@@ -454,11 +620,6 @@ await fastify.register(fastifyStatic, {
   prefix: '/',
 })
 
-// GET /api/map/:h5/:epoch
-// Returns H7-aggregated land/sea classification with real centroids.
-// h5param: H3 res-5 hex string (e.g. '851e805bfffffff')
-// epochKey: named epoch from paleo_epochs (e.g. 'roman_14bce')
-// Response: { epoch_key, sl_offset_cm, h5, cells: [{ h7, lat, lon, h7_land, h9_total, is_land }] }
 fastify.get('/api/map/:h5/:epoch', async (req, reply) => {
   const { h5: h5param, epoch: epochKey } = req.params
 
@@ -474,8 +635,6 @@ fastify.get('/api/map/:h5/:epoch', async (req, reply) => {
     return reply.code(404).send({ error: `Unknown epoch: ${epochKey}` })
   }
 
-  const slOffsetCm = epoch.sl_offset_cm
-
   let h5int
   try {
     h5int = h3HexToInt(h5param)
@@ -483,7 +642,7 @@ fastify.get('/api/map/:h5/:epoch', async (req, reply) => {
     return reply.code(400).send({ error: 'Malformed H5 ID' })
   }
 
-  const rows = stmtH7.all(slOffsetCm, h5int)
+  const rows = stmtH7.all(epoch.sl_offset_cm, h5int)
 
   if (!rows.length) {
     return reply.code(404).send({ error: `No data for H5: ${h5param}` })
@@ -500,15 +659,12 @@ fastify.get('/api/map/:h5/:epoch', async (req, reply) => {
 
   return reply.send({
     epoch_key:    epochKey,
-    sl_offset_cm: slOffsetCm,
+    sl_offset_cm: epoch.sl_offset_cm,
     h5:           h5param,
     cells,
   })
 })
 
-// GET /api/save/:token
-// Returns the current player state.
-// Priority: SQLite > JSON migration > 404.
 fastify.get('/api/save/:token', async (req, reply) => {
   const { token } = req.params
   if (!/^[0-9a-f]{8}$/.test(token)) {
@@ -518,7 +674,6 @@ fastify.get('/api/save/:token', async (req, reply) => {
   const sqlitePath = join(SAVES_DIR, `${token}.sqlite3`)
   const jsonPath   = join(SAVES_DIR, `${token}.json`)
 
-  // Case 1: SQLite exists — read from it
   if (existsSync(sqlitePath)) {
     try {
       const pdb   = openPlayerDb(token)
@@ -531,7 +686,6 @@ fastify.get('/api/save/:token', async (req, reply) => {
     }
   }
 
-  // Case 2: JSON exists — migrate to SQLite, return migrated state
   if (existsSync(jsonPath)) {
     try {
       const raw  = await readFile(jsonPath, 'utf8')
@@ -548,13 +702,9 @@ fastify.get('/api/save/:token', async (req, reply) => {
     }
   }
 
-  // Case 3: Neither exists
   return reply.code(404).send({ error: 'Save not found' })
 })
 
-// POST /api/save/:token
-// Writes player state to SQLite.
-// Creates the player database if it does not exist.
 fastify.post('/api/save/:token', async (req, reply) => {
   const { token } = req.params
   if (!/^[0-9a-f]{8}$/.test(token)) {
@@ -581,7 +731,7 @@ fastify.setNotFoundHandler((req, reply) => {
 
 try {
   await fastify.listen({ port: 3000, host: '0.0.0.0' })
-  console.log('OTIVM server running on port 3000 — OTIVM-IV')
+  console.log('OTIVM server running on port 3000 — OTIVM-IV (Changes 1+2)')
 } catch (err) {
   console.error(err)
   process.exit(1)