feat(engine): migrate monthly nation statistics

app/game-engine/src/turn/databaseHooks.ts

@@ -516,7 +516,10 @@ const buildNationUpdate = (
     rice: nation.rice,
     level: nation.level,
     typeCode: nation.typeCode,
-    meta: asJson(nation.meta),
+    meta: asJson({
+        ...nation.meta,
+        power: nation.power,
+    }),
 });
 
 const buildTroopUpdate = (

app/game-engine/src/turn/inMemoryWorld.ts

@@ -91,6 +91,7 @@ export interface InMemoryTurnWorldOptions {
     schedule: TurnSchedule;
     generalTurnHandler?: GeneralTurnHandler;
     calendarHandler?: TurnCalendarHandler;
+    autoAdvanceDiplomacyMonth?: boolean;
 }
 
 export interface TurnWorldChanges {
@@ -257,6 +258,7 @@ export class InMemoryTurnWorld {
     private schedule: TurnSchedule;
     private readonly generalTurnHandler: GeneralTurnHandler;
     private readonly calendarHandler?: TurnCalendarHandler;
+    private readonly autoAdvanceDiplomacyMonth: boolean;
     private readonly generals = new Map<number, TurnGeneral>();
     private readonly cities = new Map<number, City>();
     private readonly nations = new Map<number, Nation>();
@@ -303,6 +305,7 @@ export class InMemoryTurnWorld {
                 execute: () => ({}),
             } satisfies GeneralTurnHandler);
         this.calendarHandler = options.calendarHandler;
+        this.autoAdvanceDiplomacyMonth = options.autoAdvanceDiplomacyMonth ?? true;
 
         const worldKillturn = resolveWorldKillturn(this.state.meta);
         for (const general of snapshot.generals) {
@@ -894,7 +897,9 @@ export class InMemoryTurnWorld {
             meta,
         };
 
-        this.advanceDiplomacyMonth();
+        if (this.autoAdvanceDiplomacyMonth) {
+            this.advanceDiplomacyMonth();
+        }
         await this.calendarHandler?.onMonthChanged?.(context);
         if (nextYear !== previousYear) {
             await this.calendarHandler?.onYearChanged?.(context);
@@ -1122,20 +1127,22 @@ export class InMemoryTurnWorld {
         }
     }
 
-    private advanceDiplomacyMonth(): void {
+    advanceDiplomacyMonth(generalCounts?: Map<number, number>): void {
         if (this.diplomacy.size === 0) {
             return;
         }
-        const generalCounts = new Map<number, number>();
-        for (const general of this.generals.values()) {
-            const nationId = general.nationId;
-            if (nationId <= 0) {
-                continue;
+        const resolvedGeneralCounts = generalCounts ?? new Map<number, number>();
+        if (!generalCounts) {
+            for (const general of this.generals.values()) {
+                const nationId = general.nationId;
+                if (nationId <= 0) {
+                    continue;
+                }
+                resolvedGeneralCounts.set(nationId, (resolvedGeneralCounts.get(nationId) ?? 0) + 1);
             }
-            generalCounts.set(nationId, (generalCounts.get(nationId) ?? 0) + 1);
         }
 
-        const updated = processDiplomacyMonth(this.listDiplomacy(), generalCounts);
+        const updated = processDiplomacyMonth(this.listDiplomacy(), resolvedGeneralCounts);
         for (const entry of updated) {
             const key = buildDiplomacyKey(entry.fromNationId, entry.toNationId);
             const prev = this.diplomacy.get(key);

app/game-engine/src/turn/monthlyNationStatsHandler.ts

@@ -0,0 +1,222 @@
+import { asRecord, LiteHashDRBG, RandUtil } from '@sammo-ts/common';
+import { simpleSerialize } from '@sammo-ts/logic/war/utils.js';
+
+import type { InMemoryTurnWorld, TurnCalendarHandler } from './inMemoryWorld.js';
+
+const MAX_AVAILABLE_WAR_SETTING_COUNT = 10;
+const MONTHLY_AVAILABLE_WAR_SETTING_INCREMENT = 2;
+
+const readNumber = (value: unknown, fallback = 0): number => {
+    if (typeof value === 'number' && Number.isFinite(value)) {
+        return value;
+    }
+    if (typeof value === 'string') {
+        const parsed = Number(value);
+        if (Number.isFinite(parsed)) {
+            return parsed;
+        }
+    }
+    return fallback;
+};
+
+const resolveHiddenSeed = (world: InMemoryTurnWorld): string | number => {
+    const state = world.getState();
+    const value = state.meta.hiddenSeed ?? state.meta.seed ?? state.id;
+    return typeof value === 'string' || typeof value === 'number' ? value : String(value);
+};
+
+const calculateNationPower = (
+    world: InMemoryTurnWorld,
+    nationId: number
+): {
+    power: number;
+    totalCrew: number;
+} => {
+    const nation = world.getNationById(nationId);
+    if (!nation) {
+        return { power: 0, totalCrew: 0 };
+    }
+    const generals = world.listGenerals().filter((general) => general.nationId === nationId);
+    const suppliedCities = world.listCities().filter((city) => city.nationId === nationId && city.supplyState === 1);
+    const generalResources = generals.reduce((sum, general) => sum + general.gold + general.rice, 0);
+    const resourcePower = Math.round((nation.gold + nation.rice + generalResources) / 100);
+    const techPower = readNumber(asRecord(nation.meta).tech);
+
+    let cityPower = 0;
+    if (nation.level !== 0 && suppliedCities.length > 0) {
+        const population = suppliedCities.reduce((sum, city) => sum + city.population, 0);
+        const current = suppliedCities.reduce(
+            (sum, city) =>
+                sum + city.population + city.agriculture + city.commerce + city.security + city.wall + city.defence,
+            0
+        );
+        const maximum = suppliedCities.reduce(
+            (sum, city) =>
+                sum +
+                city.populationMax +
+                city.agricultureMax +
+                city.commerceMax +
+                city.securityMax +
+                city.wallMax +
+                city.defenceMax,
+            0
+        );
+        cityPower = maximum > 0 ? Math.round((population * current) / maximum / 100) : 0;
+    }
+
+    let generalPower = 0;
+    let dexterityPower = 0;
+    let experiencePower = 0;
+    let totalCrew = 0;
+    for (const general of generals) {
+        const meta = asRecord(general.meta);
+        const killCrew = readNumber(meta.rank_killcrew_person);
+        const deathCrew = readNumber(meta.rank_deathcrew_person);
+        const ratio = (killCrew + 1000) / (deathCrew + 1000);
+        const npcMultiplier = general.npcState < 2 ? 1.2 : 1;
+        const leadership = general.stats.leadership;
+        const leaderCore = leadership >= 40 ? leadership : 0;
+        generalPower +=
+            ratio * npcMultiplier * leaderCore * 2 +
+            (Math.sqrt(general.stats.intelligence * general.stats.strength) * 2 + leadership / 2) / 2;
+        dexterityPower +=
+            readNumber(meta.dex1) +
+            readNumber(meta.dex2) +
+            readNumber(meta.dex3) +
+            readNumber(meta.dex4) +
+            readNumber(meta.dex5);
+        experiencePower += general.experience + general.dedication;
+        totalCrew += general.crew;
+    }
+
+    const power = Math.round(
+        (resourcePower +
+            techPower +
+            cityPower +
+            generalPower +
+            Math.round(dexterityPower / 1000) +
+            Math.round(experiencePower / 100)) /
+            10
+    );
+    return { power, totalCrew };
+};
+
+const updateNationPower = (world: InMemoryTurnWorld, rng: RandUtil): void => {
+    const citiesByNation = new Map<number, string[]>();
+    for (const city of world.listCities().sort((left, right) => left.id - right.id)) {
+        const names = citiesByNation.get(city.nationId) ?? [];
+        names.push(city.name);
+        citiesByNation.set(city.nationId, names);
+    }
+
+    for (const nation of world.listNations().sort((left, right) => left.id - right.id)) {
+        const calculated = calculateNationPower(world, nation.id);
+        const power = Math.round(calculated.power * rng.nextRange(0.95, 1.05));
+        const meta = asRecord(nation.meta);
+        const previousMax = asRecord(meta.max_power);
+        const previousCities = Array.isArray(previousMax.maxCities)
+            ? previousMax.maxCities.filter((name): name is string => typeof name === 'string')
+            : [];
+        const currentCities = citiesByNation.get(nation.id) ?? [];
+        const maxPower = {
+            ...previousMax,
+            maxPower: Math.max(readNumber(previousMax.maxPower), power),
+            maxCrew: Math.max(readNumber(previousMax.maxCrew), Math.trunc(calculated.totalCrew)),
+            maxCities: currentCities.length > previousCities.length ? currentCities : previousCities,
+        };
+        world.updateNation(nation.id, {
+            power,
+            meta: {
+                ...nation.meta,
+                power,
+                max_power: maxPower,
+            },
+        });
+    }
+};
+
+export const createMonthlyNationStatsHandler = (options: {
+    getWorld: () => InMemoryTurnWorld | null;
+}): TurnCalendarHandler => ({
+    onMonthChanged: (context) => {
+        const world = options.getWorld();
+        if (!world) {
+            return;
+        }
+        const rng = new RandUtil(
+            new LiteHashDRBG(
+                simpleSerialize(resolveHiddenSeed(world), 'monthly', context.previousYear, context.previousMonth)
+            )
+        );
+        updateNationPower(world, rng);
+    },
+});
+
+export const createMonthlyDiplomacyHandler = (options: {
+    getWorld: () => InMemoryTurnWorld | null;
+}): TurnCalendarHandler => ({
+    onMonthChanged: () => {
+        const world = options.getWorld();
+        if (!world) {
+            return;
+        }
+        const cachedGeneralCounts = new Map(
+            world.listNations().map((nation) => [nation.id, Math.max(1, Math.floor(readNumber(nation.meta.gennum, 1)))])
+        );
+        world.advanceDiplomacyMonth(cachedGeneralCounts);
+    },
+});
+
+export const createMonthlyWarSettingHandler = (options: {
+    getWorld: () => InMemoryTurnWorld | null;
+}): TurnCalendarHandler => ({
+    onMonthChanged: () => {
+        const world = options.getWorld();
+        if (!world) {
+            return;
+        }
+        for (const nation of world.listNations()) {
+            const availableCount = Math.min(
+                MAX_AVAILABLE_WAR_SETTING_COUNT,
+                Math.max(0, Math.floor(readNumber(nation.meta.available_war_setting_cnt))) +
+                    MONTHLY_AVAILABLE_WAR_SETTING_INCREMENT
+            );
+            world.updateNation(nation.id, {
+                meta: {
+                    ...nation.meta,
+                    available_war_setting_cnt: availableCount,
+                },
+            });
+        }
+    },
+});
+
+export const createMonthlyNationCountHandler = (options: {
+    getWorld: () => InMemoryTurnWorld | null;
+}): TurnCalendarHandler => ({
+    onMonthChanged: () => {
+        const world = options.getWorld();
+        if (!world) {
+            return;
+        }
+        const counts = new Map<number, number>();
+        for (const general of world.listGenerals()) {
+            if (general.nationId <= 0 || general.npcState === 5) {
+                continue;
+            }
+            counts.set(general.nationId, (counts.get(general.nationId) ?? 0) + 1);
+        }
+        for (const nation of world.listNations()) {
+            const count = counts.get(nation.id);
+            if (count === undefined) {
+                continue;
+            }
+            world.updateNation(nation.id, {
+                meta: {
+                    ...nation.meta,
+                    gennum: count,
+                },
+            });
+        }
+    },
+});

app/game-engine/src/turn/turnDaemon.ts

@@ -27,6 +27,12 @@ import { composeCalendarHandlers } from './calendarHandlers.js';
 import { createIncomeHandler } from './incomeHandler.js';
 import { createNationTurnMonthlyHandler } from './nationTurnMonthlyHandler.js';
 import { createMonthlyBoundaryPreHandler } from './monthlyBoundaryPreHandler.js';
+import {
+    createMonthlyDiplomacyHandler,
+    createMonthlyNationCountHandler,
+    createMonthlyNationStatsHandler,
+    createMonthlyWarSettingHandler,
+} from './monthlyNationStatsHandler.js';
 import { createFrontStateHandler } from './frontStateHandler.js';
 import { createReservedTurnHandler } from './reservedTurnHandler.js';
 import { createReservedTurnStore } from './reservedTurnStore.js';
@@ -449,6 +455,18 @@ const createTurnDaemonRuntimeWithLease = async (
         startYear: snapshot.scenarioMeta?.startYear ?? state.currentYear,
         commandEnv: monthlyCommandEnv,
     });
+    const monthlyNationStatsHandler = createMonthlyNationStatsHandler({
+        getWorld: () => worldRef,
+    });
+    const monthlyDiplomacyHandler = createMonthlyDiplomacyHandler({
+        getWorld: () => worldRef,
+    });
+    const monthlyNationCountHandler = createMonthlyNationCountHandler({
+        getWorld: () => worldRef,
+    });
+    const monthlyWarSettingHandler = createMonthlyWarSettingHandler({
+        getWorld: () => worldRef,
+    });
     const frontStateHandler = createFrontStateHandler({
         getWorld: () => worldRef,
         map: snapshot.map ?? null,
@@ -474,9 +492,13 @@ const createTurnDaemonRuntimeWithLease = async (
     const calendarHandler = composeCalendarHandlers(
         monthlyEventHandler,
         yearbookHandler.handler,
-        options.calendarHandler ?? unification?.handler,
         monthlyBoundaryPreHandler,
         nationTurnMonthlyHandler,
+        monthlyNationStatsHandler,
+        monthlyDiplomacyHandler,
+        monthlyWarSettingHandler,
+        monthlyNationCountHandler,
+        options.calendarHandler ?? unification?.handler,
         hasEventAction('ProcessIncome') ? null : incomeHandler,
         frontStateHandler,
         neutralAuctionRegistrar.handler,
@@ -497,6 +519,7 @@ const createTurnDaemonRuntimeWithLease = async (
                 commandEnv: monthlyCommandEnv,
             })),
         calendarHandler: calendarHandler ?? undefined,
+        autoAdvanceDiplomacyMonth: false,
     };
     const world = new InMemoryTurnWorld(resolvedState, snapshot, worldOptions);
     worldRef = world;

app/game-engine/src/turn/worldLoader.ts

@@ -282,22 +282,25 @@ const mapCityRow = (row: TurnEngineCityRow): City => {
     };
 };
 
-const mapNationRow = (row: TurnEngineNationRow): Nation => ({
-    id: row.id,
-    name: row.name,
-    color: row.color,
-    capitalCityId: row.capitalCityId,
-    chiefGeneralId: row.chiefGeneralId,
-    gold: row.gold,
-    rice: row.rice,
-    power: 0,
-    level: row.level,
-    typeCode: row.typeCode,
-    meta: {
-        ...asTriggerRecord(row.meta),
-        tech: row.tech,
-    },
-});
+const mapNationRow = (row: TurnEngineNationRow): Nation => {
+    const meta = asTriggerRecord(row.meta);
+    return {
+        id: row.id,
+        name: row.name,
+        color: row.color,
+        capitalCityId: row.capitalCityId,
+        chiefGeneralId: row.chiefGeneralId,
+        gold: row.gold,
+        rice: row.rice,
+        power: readMetaNumber(meta, 'power') ?? 0,
+        level: row.level,
+        typeCode: row.typeCode,
+        meta: {
+            ...meta,
+            tech: row.tech,
+        },
+    };
+};
 
 const mapDiplomacyRow = (row: TurnEngineDiplomacyRow): TurnDiplomacy => {
     const { meta, dead } = readDiplomacyMeta(asRecord(row.meta));

app/game-engine/test/monthlyNationStatsHandler.test.ts

@@ -0,0 +1,241 @@
+import { describe, expect, it } from 'vitest';
+import type { City, Nation } from '@sammo-ts/logic';
+
+import { composeCalendarHandlers } from '../src/turn/calendarHandlers.js';
+import { InMemoryTurnWorld } from '../src/turn/inMemoryWorld.js';
+import {
+    createMonthlyDiplomacyHandler,
+    createMonthlyNationCountHandler,
+    createMonthlyNationStatsHandler,
+    createMonthlyWarSettingHandler,
+} from '../src/turn/monthlyNationStatsHandler.js';
+import type { TurnGeneral, TurnWorldSnapshot, TurnWorldState } from '../src/turn/types.js';
+
+const buildGeneral = (options: {
+    id: number;
+    nationId: number;
+    npcState: number;
+    gold: number;
+    rice: number;
+    crew: number;
+    leadership: number;
+    strength: number;
+    intelligence: number;
+    experience: number;
+    dedication: number;
+    dexterity: number[];
+    killCrew: number;
+    deathCrew: number;
+}): TurnGeneral => ({
+    id: options.id,
+    name: `장수${options.id}`,
+    nationId: options.nationId,
+    cityId: options.id,
+    troopId: 0,
+    stats: {
+        leadership: options.leadership,
+        strength: options.strength,
+        intelligence: options.intelligence,
+    },
+    experience: options.experience,
+    dedication: options.dedication,
+    officerLevel: 1,
+    role: {
+        personality: null,
+        specialDomestic: null,
+        specialWar: null,
+        items: { horse: null, weapon: null, book: null, item: null },
+    },
+    injury: 0,
+    gold: options.gold,
+    rice: options.rice,
+    crew: options.crew,
+    crewTypeId: 1100,
+    train: 0,
+    atmos: 0,
+    age: 20,
+    npcState: options.npcState,
+    triggerState: { flags: {}, counters: {}, modifiers: {}, meta: {} },
+    meta: {
+        killturn: 0,
+        dex1: options.dexterity[0] ?? 0,
+        dex2: options.dexterity[1] ?? 0,
+        dex3: options.dexterity[2] ?? 0,
+        dex4: options.dexterity[3] ?? 0,
+        dex5: options.dexterity[4] ?? 0,
+        rank_killcrew_person: options.killCrew,
+        rank_deathcrew_person: options.deathCrew,
+    },
+    turnTime: new Date('0193-01-01T00:00:00.000Z'),
+});
+
+const buildCity = (id: number, nationId: number, scale: number): City => ({
+    id,
+    name: nationId === 1 ? '갑성' : '을성',
+    nationId,
+    level: 4,
+    state: 0,
+    population: 1_000 * scale,
+    populationMax: 2_000 * scale,
+    agriculture: 100 * scale,
+    agricultureMax: 200 * scale,
+    commerce: 100 * scale,
+    commerceMax: 200 * scale,
+    security: 100 * scale,
+    securityMax: 200 * scale,
+    supplyState: 1,
+    frontState: 0,
+    defence: 100 * scale,
+    defenceMax: 200 * scale,
+    wall: 100 * scale,
+    wallMax: 200 * scale,
+    conflict: {},
+    meta: {},
+});
+
+const buildNation = (
+    id: number,
+    patch: Pick<Nation, 'gold' | 'rice' | 'power' | 'level'> & { meta: Nation['meta'] }
+): Nation => ({
+    id,
+    name: id === 1 ? '갑국' : '을국',
+    color: '#777777',
+    capitalCityId: null,
+    chiefGeneralId: null,
+    typeCode: 'che_중립',
+    ...patch,
+});
+
+describe('monthly nation statistics boundary', () => {
+    it('matches the fixed legacy power, maxima, war-setting count, and final general cache', async () => {
+        const state: TurnWorldState = {
+            id: 1,
+            currentYear: 193,
+            currentMonth: 1,
+            tickSeconds: 600,
+            lastTurnTime: new Date('0193-01-01T00:00:00.000Z'),
+            meta: { hiddenSeed: 'monthly-post-nation-stats-fixture' },
+        };
+        const snapshot: TurnWorldSnapshot = {
+            scenarioConfig: {
+                stat: { total: 300, min: 10, max: 100, npcTotal: 150, npcMax: 50, npcMin: 10, chiefMin: 70 },
+                iconPath: '',
+                map: {},
+                const: {},
+                environment: { mapName: 'test', unitSet: 'default' },
+            },
+            map: { id: 'test', name: 'test', cities: [] },
+            diplomacy: [],
+            events: [],
+            initialEvents: [],
+            generals: [
+                buildGeneral({
+                    id: 1,
+                    nationId: 1,
+                    npcState: 0,
+                    gold: 1_000,
+                    rice: 2_000,
+                    crew: 100,
+                    leadership: 50,
+                    strength: 40,
+                    intelligence: 30,
+                    experience: 100,
+                    dedication: 200,
+                    dexterity: [1_000, 0, 0, 0, 0],
+                    killCrew: 100,
+                    deathCrew: 0,
+                }),
+                buildGeneral({
+                    id: 2,
+                    nationId: 2,
+                    npcState: 2,
+                    gold: 3_000,
+                    rice: 4_000,
+                    crew: 200,
+                    leadership: 60,
+                    strength: 50,
+                    intelligence: 40,
+                    experience: 300,
+                    dedication: 400,
+                    dexterity: [2_000, 1_000, 0, 0, 0],
+                    killCrew: 0,
+                    deathCrew: 100,
+                }),
+            ],
+            cities: [buildCity(1, 1, 1), buildCity(2, 2, 2)],
+            nations: [
+                buildNation(1, {
+                    gold: 10_000,
+                    rice: 20_000,
+                    power: 7,
+                    level: 2,
+                    meta: {
+                        tech: 100,
+                        gennum: 9,
+                        available_war_setting_cnt: 1,
+                        max_power: {
+                            maxPower: 999,
+                            maxCrew: 50,
+                            maxCities: ['옛도시', '옛도시2'],
+                        },
+                    },
+                }),
+                buildNation(2, {
+                    gold: 2_000,
+                    rice: 3_000,
+                    power: 8,
+                    level: 1,
+                    meta: { tech: 50, gennum: 8 },
+                }),
+            ],
+            troops: [],
+        };
+        let world: InMemoryTurnWorld | null = null;
+        const trace: number[] = [];
+        world = new InMemoryTurnWorld(state, snapshot, {
+            schedule: { entries: [{ startMinute: 0, tickMinutes: 10 }] },
+            autoAdvanceDiplomacyMonth: false,
+            calendarHandler: composeCalendarHandlers(
+                {
+                    onMonthChanged: () => {
+                        trace.push(world?.getNationById(1)?.power ?? -1);
+                    },
+                },
+                createMonthlyNationStatsHandler({ getWorld: () => world }),
+                createMonthlyDiplomacyHandler({ getWorld: () => world }),
+                createMonthlyWarSettingHandler({ getWorld: () => world }),
+                createMonthlyNationCountHandler({ getWorld: () => world })
+            ),
+        });
+
+        await world.advanceMonth(new Date('0193-02-01T00:00:00.000Z'));
+
+        expect(trace).toEqual([7]);
+        expect(world.getNationById(1)).toMatchObject({
+            power: 64,
+            meta: {
+                power: 64,
+                gennum: 1,
+                available_war_setting_cnt: 3,
+                max_power: {
+                    maxPower: 999,
+                    maxCrew: 100,
+                    maxCities: ['옛도시', '옛도시2'],
+                },
+            },
+        });
+        expect(world.getNationById(2)).toMatchObject({
+            power: 37,
+            meta: {
+                power: 37,
+                gennum: 1,
+                available_war_setting_cnt: 2,
+                max_power: {
+                    maxPower: 37,
+                    maxCrew: 200,
+                    maxCities: ['을성'],
+                },
+            },
+        });
+    });
+});

app/game-engine/test/monthlyNationStatsPersistence.integration.test.ts

@@ -0,0 +1,239 @@
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { createGamePostgresConnector, type GamePrismaClient } from '@sammo-ts/infra';
+
+import { composeCalendarHandlers } from '../src/turn/calendarHandlers.js';
+import { createDatabaseTurnHooks } from '../src/turn/databaseHooks.js';
+import { InMemoryTurnWorld } from '../src/turn/inMemoryWorld.js';
+import {
+    createMonthlyDiplomacyHandler,
+    createMonthlyNationCountHandler,
+    createMonthlyNationStatsHandler,
+    createMonthlyWarSettingHandler,
+} from '../src/turn/monthlyNationStatsHandler.js';
+import { loadTurnWorldFromDatabase } from '../src/turn/worldLoader.js';
+
+const databaseUrl = process.env.INPUT_EVENT_DATABASE_URL;
+const integration = describe.skipIf(!databaseUrl);
+const generalIds = [991_301, 991_302];
+const cityIds = [991_301, 991_302];
+const nationIds = [991_301, 991_302];
+const scenarioCode = 'monthly-nation-stats-persistence';
+
+integration('monthly nation statistics persistence', () => {
+    let db: GamePrismaClient;
+    let closeDb: (() => Promise<void>) | undefined;
+
+    beforeAll(async () => {
+        const connector = createGamePostgresConnector({ url: databaseUrl! });
+        await connector.connect();
+        db = connector.prisma;
+        closeDb = () => connector.disconnect();
+        await db.rankData.deleteMany({ where: { generalId: { in: generalIds } } });
+        await db.general.deleteMany({ where: { id: { in: generalIds } } });
+        await db.city.deleteMany({ where: { id: { in: cityIds } } });
+        await db.nation.deleteMany({ where: { id: { in: nationIds } } });
+        // The turn loader intentionally expects one world per isolated game schema.
+        await db.worldState.deleteMany();
+    });
+
+    afterAll(async () => {
+        await db.rankData.deleteMany({ where: { generalId: { in: generalIds } } });
+        await db.general.deleteMany({ where: { id: { in: generalIds } } });
+        await db.city.deleteMany({ where: { id: { in: cityIds } } });
+        await db.nation.deleteMany({ where: { id: { in: nationIds } } });
+        await db.worldState.deleteMany({ where: { scenarioCode } });
+        await closeDb?.();
+    });
+
+    it('loads previous power and commits power, maxima, war-setting count, and actual general count', async () => {
+        await db.nation.createMany({
+            data: [
+                {
+                    id: nationIds[0]!,
+                    name: '갑국',
+                    color: '#777777',
+                    gold: 10_000,
+                    rice: 20_000,
+                    tech: 100,
+                    level: 2,
+                    typeCode: 'che_중립',
+                    meta: {
+                        power: 7,
+                        gennum: 9,
+                        available_war_setting_cnt: 1,
+                        max_power: {
+                            maxPower: 999,
+                            maxCrew: 50,
+                            maxCities: ['옛도시', '옛도시2'],
+                        },
+                    },
+                },
+                {
+                    id: nationIds[1]!,
+                    name: '을국',
+                    color: '#777777',
+                    gold: 2_000,
+                    rice: 3_000,
+                    tech: 50,
+                    level: 1,
+                    typeCode: 'che_중립',
+                    meta: { power: 8, gennum: 8 },
+                },
+            ],
+        });
+        await db.city.createMany({
+            data: cityIds.map((id, index) => {
+                const scale = index + 1;
+                return {
+                    id,
+                    name: index === 0 ? '갑성' : '을성',
+                    level: 4,
+                    nationId: nationIds[index]!,
+                    supplyState: 1,
+                    population: 1_000 * scale,
+                    populationMax: 2_000 * scale,
+                    agriculture: 100 * scale,
+                    agricultureMax: 200 * scale,
+                    commerce: 100 * scale,
+                    commerceMax: 200 * scale,
+                    security: 100 * scale,
+                    securityMax: 200 * scale,
+                    defence: 100 * scale,
+                    defenceMax: 200 * scale,
+                    wall: 100 * scale,
+                    wallMax: 200 * scale,
+                    region: 1,
+                };
+            }),
+        });
+        await db.general.createMany({
+            data: [
+                {
+                    id: generalIds[0]!,
+                    name: '갑장',
+                    nationId: nationIds[0]!,
+                    cityId: cityIds[0]!,
+                    npcState: 0,
+                    leadership: 50,
+                    strength: 40,
+                    intel: 30,
+                    experience: 100,
+                    dedication: 200,
+                    gold: 1_000,
+                    rice: 2_000,
+                    crew: 100,
+                    turnTime: new Date('0193-01-01T00:00:00.000Z'),
+                    meta: { killturn: 0, dex1: 1_000, dex2: 0, dex3: 0, dex4: 0, dex5: 0 },
+                },
+                {
+                    id: generalIds[1]!,
+                    name: '을장',
+                    nationId: nationIds[1]!,
+                    cityId: cityIds[1]!,
+                    npcState: 2,
+                    leadership: 60,
+                    strength: 50,
+                    intel: 40,
+                    experience: 300,
+                    dedication: 400,
+                    gold: 3_000,
+                    rice: 4_000,
+                    crew: 200,
+                    turnTime: new Date('0193-01-01T00:00:00.000Z'),
+                    meta: { killturn: 0, dex1: 2_000, dex2: 1_000, dex3: 0, dex4: 0, dex5: 0 },
+                },
+            ],
+        });
+        await db.rankData.createMany({
+            data: [
+                { generalId: generalIds[0]!, nationId: nationIds[0]!, type: 'killcrew_person', value: 100 },
+                { generalId: generalIds[0]!, nationId: nationIds[0]!, type: 'deathcrew_person', value: 0 },
+                { generalId: generalIds[1]!, nationId: nationIds[1]!, type: 'killcrew_person', value: 0 },
+                { generalId: generalIds[1]!, nationId: nationIds[1]!, type: 'deathcrew_person', value: 100 },
+            ],
+        });
+        const worldRow = await db.worldState.create({
+            data: {
+                scenarioCode,
+                currentYear: 193,
+                currentMonth: 1,
+                tickSeconds: 600,
+                config: {
+                    stat: { total: 300, min: 10, max: 100, npcTotal: 150, npcMax: 50, npcMin: 10, chiefMin: 70 },
+                    iconPath: '.',
+                    map: {},
+                    const: {},
+                    environment: { mapName: 'che', unitSet: 'che' },
+                },
+                meta: { hiddenSeed: 'monthly-post-nation-stats-fixture' },
+            },
+        });
+
+        const loaded = await loadTurnWorldFromDatabase({ databaseUrl: databaseUrl! });
+        expect(
+            loaded.snapshot.nations
+                .filter((nation) => nationIds.includes(nation.id))
+                .sort((left, right) => left.id - right.id)
+                .map((nation) => nation.power)
+        ).toEqual([7, 8]);
+
+        let world: InMemoryTurnWorld | null = null;
+        world = new InMemoryTurnWorld(loaded.state, loaded.snapshot, {
+            schedule: { entries: [{ startMinute: 0, tickMinutes: 10 }] },
+            autoAdvanceDiplomacyMonth: false,
+            calendarHandler: composeCalendarHandlers(
+                createMonthlyNationStatsHandler({ getWorld: () => world }),
+                createMonthlyDiplomacyHandler({ getWorld: () => world }),
+                createMonthlyWarSettingHandler({ getWorld: () => world }),
+                createMonthlyNationCountHandler({ getWorld: () => world })
+            ),
+        });
+        const hooks = await createDatabaseTurnHooks(databaseUrl!, world);
+        try {
+            await world.advanceMonth(new Date('0193-02-01T00:00:00.000Z'));
+            const updatedPowers = nationIds.map((id) => world?.getNationById(id)?.power);
+            expect(updatedPowers.every((power) => typeof power === 'number' && power > 0)).toBe(true);
+            await hooks.hooks.flushChanges?.({
+                lastTurnTime: '0193-02-01T00:00:00.000Z',
+                processedGenerals: 0,
+                processedTurns: 0,
+                durationMs: 0,
+                partial: false,
+            });
+
+            const rows = await db.nation.findMany({
+                where: { id: { in: nationIds } },
+                orderBy: { id: 'asc' },
+                select: { meta: true },
+            });
+            expect(rows.map((row) => row.meta)).toEqual([
+                expect.objectContaining({
+                    power: updatedPowers[0],
+                    gennum: 1,
+                    available_war_setting_cnt: 3,
+                    max_power: {
+                        maxPower: 999,
+                        maxCrew: 100,
+                        maxCities: ['옛도시', '옛도시2'],
+                    },
+                }),
+                expect.objectContaining({
+                    power: updatedPowers[1],
+                    gennum: 1,
+                    available_war_setting_cnt: 2,
+                    max_power: {
+                        maxPower: updatedPowers[1],
+                        maxCrew: 200,
+                        maxCities: ['을성'],
+                    },
+                }),
+            ]);
+            expect(await db.worldState.findUniqueOrThrow({ where: { id: worldRow.id } })).toMatchObject({
+                currentYear: 193,
+                currentMonth: 2,
+            });
+        } finally {
+            await hooks.close();
+        }
+    });
+});