diff --git a/docs/architecture/overview.md b/docs/architecture/overview.md
index 6c97129..2d2a21e 100644
--- a/docs/architecture/overview.md
+++ b/docs/architecture/overview.md
@@ -33,6 +33,7 @@ monorepo plan is prepared alongside it.
 
 - Legacy entities and DB schema overview: `docs/architecture/legacy-entities.md`
 - Legacy engine map: `docs/architecture/legacy-engine.md`
+- Postgres schema proposal (rewrite): `docs/architecture/postgres-schema.md`
 
 ## Cross-Cutting Policies
 
diff --git a/docs/architecture/postgres-schema.md b/docs/architecture/postgres-schema.md
new file mode 100644
index 0000000..7211a08
--- /dev/null
+++ b/docs/architecture/postgres-schema.md
@@ -0,0 +1,304 @@
+# Postgres Schema Proposal (sammo-ts)
+
+This document proposes a PostgreSQL schema baseline for the TypeScript rewrite.
+It keeps legacy semantics while enabling flexible growth through JSONB `meta`
+fields. Use this as the starting point for Prisma models and migrations.
+
+## Design Principles
+
+- Prefer explicit columns for hot paths and indexed filters.
+- Use JSONB `meta` for infrequently queried, extensible, or experimental data.
+- Keep JSONB values as objects (not arrays or scalars).
+- Use partial or expression indexes when a JSONB key becomes a hot filter.
+- If multiple server profiles live in one database, add `server_id` to every
+  table and index it; otherwise, use one database per profile.
+
+## Meta Policy (Reset)
+
+- The rewrite resets naming: legacy `aux` is now `meta`.
+- `meta` is the default extension surface for each entity.
+- Keys with explicit enum contracts (ex: `NationAuxKey`) should live in a
+  dedicated table or typed column, not inside `meta`.
+- When a key transitions into a hot query/filter, promote it to a column or
+  `*_flags` table and keep the old value mirrored during migration.
+
+## Core Tables (DDL Sketch)
+
+```sql
+-- users: account-level identity (game servers can share this table)
+CREATE TABLE app_user (
+    id BIGSERIAL PRIMARY KEY,
+    login_id TEXT NOT NULL UNIQUE,
+    display_name TEXT NOT NULL,
+    password_hash TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    last_login_at TIMESTAMPTZ
+);
+
+-- world_state: per-server runtime state and config
+CREATE TABLE world_state (
+    id SMALLSERIAL PRIMARY KEY,
+    scenario_code TEXT NOT NULL,
+    current_year SMALLINT NOT NULL,
+    current_month SMALLINT NOT NULL,
+    tick_seconds INTEGER NOT NULL,
+    config JSONB NOT NULL DEFAULT '{}'::jsonb,
+    meta JSONB NOT NULL DEFAULT '{}'::jsonb,
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CHECK (jsonb_typeof(config) = 'object'),
+    CHECK (jsonb_typeof(meta) = 'object')
+);
+
+CREATE TABLE nation (
+    id BIGSERIAL PRIMARY KEY,
+    name TEXT NOT NULL,
+    color TEXT NOT NULL,
+    capital_city_id BIGINT,
+    gold INTEGER NOT NULL DEFAULT 0,
+    rice INTEGER NOT NULL DEFAULT 0,
+    bill SMALLINT NOT NULL DEFAULT 0,
+    rate SMALLINT NOT NULL DEFAULT 0,
+    rate_tmp SMALLINT NOT NULL DEFAULT 0,
+    secret_limit SMALLINT NOT NULL DEFAULT 3,
+    chief_general_id BIGINT NOT NULL DEFAULT 0,
+    scout_level SMALLINT NOT NULL DEFAULT 0,
+    war_state SMALLINT NOT NULL DEFAULT 0,
+    strategic_cmd_limit SMALLINT NOT NULL DEFAULT 36,
+    surrender_limit SMALLINT NOT NULL DEFAULT 72,
+    tech REAL NOT NULL DEFAULT 0,
+    power INTEGER NOT NULL DEFAULT 0,
+    level SMALLINT NOT NULL DEFAULT 0,
+    type_code TEXT NOT NULL DEFAULT 'che_중립',
+    spy JSONB NOT NULL DEFAULT '{}'::jsonb,
+    meta JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CHECK (jsonb_typeof(spy) = 'object'),
+    CHECK (jsonb_typeof(meta) = 'object')
+);
+
+CREATE TABLE city (
+    id BIGSERIAL PRIMARY KEY,
+    name TEXT NOT NULL,
+    level SMALLINT NOT NULL,
+    nation_id BIGINT NOT NULL DEFAULT 0,
+    supply_state SMALLINT NOT NULL DEFAULT 1,
+    front_state SMALLINT NOT NULL DEFAULT 0,
+    pop INTEGER NOT NULL,
+    pop_max INTEGER NOT NULL,
+    agri INTEGER NOT NULL,
+    agri_max INTEGER NOT NULL,
+    comm INTEGER NOT NULL,
+    comm_max INTEGER NOT NULL,
+    secu INTEGER NOT NULL,
+    secu_max INTEGER NOT NULL,
+    trust INTEGER NOT NULL DEFAULT 0,
+    trade INTEGER NOT NULL DEFAULT 100,
+    dead SMALLINT NOT NULL DEFAULT 0,
+    def INTEGER NOT NULL DEFAULT 0,
+    def_max INTEGER NOT NULL DEFAULT 0,
+    wall INTEGER NOT NULL DEFAULT 0,
+    wall_max INTEGER NOT NULL DEFAULT 0,
+    officer_set INTEGER NOT NULL DEFAULT 0,
+    state SMALLINT NOT NULL DEFAULT 0,
+    region SMALLINT NOT NULL DEFAULT 0,
+    term SMALLINT NOT NULL DEFAULT 0,
+    conflict JSONB NOT NULL DEFAULT '{}'::jsonb,
+    meta JSONB NOT NULL DEFAULT '{}'::jsonb,
+    CHECK (jsonb_typeof(conflict) = 'object'),
+    CHECK (jsonb_typeof(meta) = 'object')
+);
+
+CREATE TABLE troop (
+    id BIGSERIAL PRIMARY KEY,
+    leader_general_id BIGINT NOT NULL,
+    nation_id BIGINT NOT NULL DEFAULT 0,
+    name TEXT NOT NULL,
+    meta JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CHECK (jsonb_typeof(meta) = 'object')
+);
+
+CREATE TABLE general (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT,
+    name TEXT NOT NULL,
+    nation_id BIGINT NOT NULL DEFAULT 0,
+    city_id BIGINT NOT NULL DEFAULT 0,
+    troop_id BIGINT NOT NULL DEFAULT 0,
+    npc_state SMALLINT NOT NULL DEFAULT 0,
+    affinity SMALLINT NOT NULL DEFAULT 0,
+    born_year SMALLINT NOT NULL DEFAULT 180,
+    dead_year SMALLINT NOT NULL DEFAULT 300,
+    picture TEXT NOT NULL,
+    image_server SMALLINT NOT NULL DEFAULT 0,
+    leadership SMALLINT NOT NULL DEFAULT 50,
+    leadership_exp SMALLINT NOT NULL DEFAULT 0,
+    strength SMALLINT NOT NULL DEFAULT 50,
+    strength_exp SMALLINT NOT NULL DEFAULT 0,
+    intel SMALLINT NOT NULL DEFAULT 50,
+    intel_exp SMALLINT NOT NULL DEFAULT 0,
+    injury SMALLINT NOT NULL DEFAULT 0,
+    experience INTEGER NOT NULL DEFAULT 0,
+    dedication INTEGER NOT NULL DEFAULT 0,
+    officer_level SMALLINT NOT NULL DEFAULT 0,
+    officer_city INTEGER NOT NULL DEFAULT 0,
+    permission TEXT NOT NULL DEFAULT 'normal',
+    gold INTEGER NOT NULL DEFAULT 1000,
+    rice INTEGER NOT NULL DEFAULT 1000,
+    crew INTEGER NOT NULL DEFAULT 0,
+    crew_type SMALLINT NOT NULL DEFAULT 0,
+    train SMALLINT NOT NULL DEFAULT 0,
+    atmos SMALLINT NOT NULL DEFAULT 0,
+    weapon_code TEXT NOT NULL DEFAULT 'None',
+    book_code TEXT NOT NULL DEFAULT 'None',
+    horse_code TEXT NOT NULL DEFAULT 'None',
+    item_code TEXT NOT NULL DEFAULT 'None',
+    turn_time TIMESTAMPTZ NOT NULL,
+    recent_war_time TIMESTAMPTZ,
+    make_limit SMALLINT NOT NULL DEFAULT 0,
+    kill_turn SMALLINT,
+    block_state SMALLINT NOT NULL DEFAULT 0,
+    ded_level SMALLINT NOT NULL DEFAULT 0,
+    exp_level SMALLINT NOT NULL DEFAULT 0,
+    age SMALLINT NOT NULL DEFAULT 20,
+    start_age SMALLINT NOT NULL DEFAULT 20,
+    belong SMALLINT NOT NULL DEFAULT 1,
+    betray SMALLINT NOT NULL DEFAULT 0,
+    personal_code TEXT NOT NULL DEFAULT 'None',
+    special_code TEXT NOT NULL DEFAULT 'None',
+    spec_age SMALLINT NOT NULL DEFAULT 0,
+    special2_code TEXT NOT NULL DEFAULT 'None',
+    spec2_age SMALLINT NOT NULL DEFAULT 0,
+    defence_train SMALLINT NOT NULL DEFAULT 80,
+    tournament_state SMALLINT NOT NULL DEFAULT 0,
+    last_turn JSONB NOT NULL DEFAULT '{}'::jsonb,
+    meta JSONB NOT NULL DEFAULT '{}'::jsonb,
+    penalty JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CHECK (jsonb_typeof(last_turn) = 'object'),
+    CHECK (jsonb_typeof(meta) = 'object'),
+    CHECK (jsonb_typeof(penalty) = 'object')
+);
+
+CREATE TABLE general_turn (
+    id BIGSERIAL PRIMARY KEY,
+    general_id BIGINT NOT NULL REFERENCES general(id) ON DELETE CASCADE,
+    turn_idx SMALLINT NOT NULL,
+    action_code TEXT NOT NULL,
+    arg JSONB NOT NULL DEFAULT '{}'::jsonb,
+    brief TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE (general_id, turn_idx),
+    CHECK (jsonb_typeof(arg) = 'object')
+);
+
+CREATE TABLE nation_turn (
+    id BIGSERIAL PRIMARY KEY,
+    nation_id BIGINT NOT NULL REFERENCES nation(id) ON DELETE CASCADE,
+    officer_level SMALLINT NOT NULL,
+    turn_idx SMALLINT NOT NULL,
+    action_code TEXT NOT NULL,
+    arg JSONB NOT NULL DEFAULT '{}'::jsonb,
+    brief TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE (nation_id, officer_level, turn_idx),
+    CHECK (jsonb_typeof(arg) = 'object')
+);
+
+CREATE TABLE diplomacy (
+    id BIGSERIAL PRIMARY KEY,
+    src_nation_id BIGINT NOT NULL,
+    dest_nation_id BIGINT NOT NULL,
+    state_code TEXT NOT NULL,
+    term SMALLINT NOT NULL DEFAULT 0,
+    is_dead BOOLEAN NOT NULL DEFAULT false,
+    is_showing BOOLEAN NOT NULL DEFAULT true,
+    meta JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CHECK (jsonb_typeof(meta) = 'object')
+);
+
+CREATE TABLE message (
+    id BIGSERIAL PRIMARY KEY,
+    mailbox_code TEXT NOT NULL,
+    message_type TEXT NOT NULL,
+    src_id BIGINT,
+    dest_id BIGINT,
+    sent_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    valid_until TIMESTAMPTZ,
+    payload JSONB NOT NULL DEFAULT '{}'::jsonb,
+    meta JSONB NOT NULL DEFAULT '{}'::jsonb,
+    CHECK (jsonb_typeof(payload) = 'object'),
+    CHECK (jsonb_typeof(meta) = 'object')
+);
+
+CREATE TABLE event (
+    id BIGSERIAL PRIMARY KEY,
+    target_code TEXT NOT NULL,
+    priority SMALLINT NOT NULL DEFAULT 0,
+    condition JSONB NOT NULL DEFAULT '{}'::jsonb,
+    action JSONB NOT NULL DEFAULT '{}'::jsonb,
+    meta JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CHECK (jsonb_typeof(condition) = 'object'),
+    CHECK (jsonb_typeof(action) = 'object'),
+    CHECK (jsonb_typeof(meta) = 'object')
+);
+```
+
+## Meta Indexing Examples
+
+```sql
+-- Generic meta GIN index (use jsonb_path_ops when keys are simple)
+CREATE INDEX idx_general_meta_gin ON general USING GIN (meta jsonb_path_ops);
+
+-- Hot key promotion: when a key becomes a frequent filter
+CREATE INDEX idx_general_meta_trait ON general ((meta ->> 'trait_code'));
+
+-- JSONB object safety (optional additional guardrails)
+ALTER TABLE general ADD CONSTRAINT general_meta_object CHECK (jsonb_typeof(meta) = 'object');
+```
+
+## `NationAuxKey` Handling
+
+Legacy `NationAuxKey` is an explicit enum contract. Do not store these keys in
+`nation.meta`. Use a dedicated table or typed column instead.
+
+```sql
+CREATE TYPE nation_aux_key AS ENUM (
+    'can_국기변경',
+    'can_국호변경',
+    'did_특성초토화',
+    'can_무작위수도이전',
+    'can_대검병사용',
+    'can_극병사용',
+    'can_화시병사용',
+    'can_원융노병사용',
+    'can_산저병사용',
+    'can_상병사용',
+    'can_음귀병사용',
+    'can_무희사용',
+    'can_화륜차사용'
+);
+
+CREATE TABLE nation_flag (
+    nation_id BIGINT NOT NULL REFERENCES nation(id) ON DELETE CASCADE,
+    key nation_aux_key NOT NULL,
+    value JSONB NOT NULL DEFAULT 'true'::jsonb,
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    PRIMARY KEY (nation_id, key)
+);
+```
+
+## Migration Notes
+
+- Legacy `aux` is renamed to `meta` in the rewrite; migrate values 1:1.
+- `meta`, `last_turn`, `penalty`, `arg`, and message payloads map naturally to
+  JSONB. Keep them as objects to ease validations and reuse existing TS RNG
+  tooling without ad-hoc randomness.
+- Favor deterministic keys in JSONB for reproducible action logs and turn
+  outcomes.
+- If a JSONB key starts affecting query plans or UI filters, promote it to a
+  typed column and keep a backfill step in the migration.