openai service and basic tables with migrations

db/migrations/20260102021529_wa_identity_map.sql

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+-- migrate:up
+create table wa_identity_map (
+  tenant_id uuid not null references tenants(id) on delete cascade,
+  wa_chat_id text not null,
+  woo_customer_id bigint not null,
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now(),
+  primary key (tenant_id, wa_chat_id)
+);
+
+-- migrate:down
+drop table if exists wa_identity_map;

db/migrations/20260102021640_tenants.sql

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+-- migrate:up
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+CREATE TABLE tenants (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  key text NOT NULL UNIQUE,
+  name text NOT NULL,
+  created_at timestamptz NOT NULL DEFAULT now()
+);
+
+-- migrate:down
+DROP TABLE IF EXISTS tenants;
+DROP EXTENSION IF EXISTS pgcrypto;

db/migrations/20260102021749_wa_conversation_state.sql

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+-- migrate:up
+create table wa_conversation_state (
+  tenant_id uuid not null references tenants(id) on delete cascade,
+  wa_chat_id text not null,
+
+  state text not null,                 -- IDLE / BUILDING_ORDER / WAITING_PAYMENT
+  last_intent text null,
+  last_order_id bigint null,
+
+  context jsonb not null default '{}'::jsonb,
+
+  state_updated_at timestamptz not null default now(),
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now(),
+
+  primary key (tenant_id, wa_chat_id)
+);
+
+create index idx_state_tenant_updated
+  on wa_conversation_state (tenant_id, updated_at desc);
+
+-- migrate:down
+drop table if exists wa_conversation_state;

db/migrations/20260102021829_wa_messages.sql

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+-- migrate:up
+create table wa_messages (
+  id bigserial primary key,
+  tenant_id uuid not null references tenants(id) on delete cascade,
+  wa_chat_id text not null,
+
+  provider text not null,          -- sim / evolution / twilio
+  message_id text not null,        -- idempotencia por provider
+  direction text not null,         -- in / out
+
+  ts timestamptz not null default now(),
+  text text null,
+  payload jsonb not null default '{}'::jsonb,
+
+  run_id uuid null,
+
+  unique (tenant_id, provider, message_id)
+);
+
+create index idx_msgs_tenant_chat_ts
+  on wa_messages (tenant_id, wa_chat_id, ts desc);
+
+-- migrate:down
+drop table if exists wa_messages;

db/migrations/20260102021907_conversation_runs.sql

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+-- migrate:up
+create table conversation_runs (
+  id uuid primary key default gen_random_uuid(),
+  tenant_id uuid not null references tenants(id) on delete cascade,
+  wa_chat_id text not null,
+  message_id text not null,
+
+  ts timestamptz not null default now(),
+  prev_state text null,
+  user_text text null,
+
+  llm_output jsonb null,
+  tools jsonb not null default '[]'::jsonb,
+  invariants jsonb not null default '{}'::jsonb,
+
+  final_reply text null,
+  order_id bigint null,
+  payment_link text null,
+
+  status text not null default 'ok', -- ok | warn | error
+  error_code text null,
+  error_detail text null,
+  latency_ms int null,
+
+  unique (tenant_id, message_id)
+);
+
+create index idx_runs_tenant_chat_ts
+  on conversation_runs (tenant_id, wa_chat_id, ts desc);
+
+-- migrate:down
+drop table if exists conversation_runs;