fix

apps/api/sql/schema/046_ai_usage_cost.sql

@@ -0,0 +1,65 @@
+-- +goose Up
+-- Durable AI cost accounting, deliberately separate from ai_call_logs.
+--
+-- ai_call_logs holds full prompts and is pruned after 7 days. Cost has to outlive
+-- that by years, so usage is rolled up per day / company / user / model / role at
+-- capture time. One row per combination per day keeps three years small: a busy
+-- tenant with 5 users and 3 roles adds ~45 rows a day, not one per product.
+--
+-- Cost is stored in micro-USD integers, never floats: summing millions of
+-- fractional-cent calls in float drifts, and money must add up exactly.
+
+CREATE TABLE IF NOT EXISTS ai_model_prices (
+    model            TEXT PRIMARY KEY,
+    -- Micro-USD per 1,000,000 tokens. $0.20/1M = 200000 micros.
+    input_micros_per_mtok        BIGINT NOT NULL DEFAULT 0,
+    cached_input_micros_per_mtok BIGINT NOT NULL DEFAULT 0,
+    output_micros_per_mtok       BIGINT NOT NULL DEFAULT 0,
+    source     TEXT NOT NULL DEFAULT '',
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+-- OpenAI GPT-5.6 family, rates effective 2026-07-30.
+-- Admin can UPDATE these when list prices change; already-recorded cost is never
+-- recalculated, so history keeps the price that applied at the time.
+INSERT INTO ai_model_prices (model, input_micros_per_mtok, cached_input_micros_per_mtok, output_micros_per_mtok, source)
+VALUES
+    ('gpt-5.6-luna',  200000,  20000,  1200000, 'openai list price 2026-07-30'),
+    ('gpt-5.6-terra', 2000000, 200000, 12000000, 'openai list price 2026-07-30'),
+    ('gpt-5.6-sol',   5000000, 500000, 30000000, 'openai list price 2026-07-30')
+ON CONFLICT (model) DO NOTHING;
+
+CREATE TABLE IF NOT EXISTS ai_usage_daily (
+    day            DATE NOT NULL,
+    -- Nil UUID rather than NULL: these are primary-key columns and NULL would let
+    -- duplicate rows accumulate instead of upserting.
+    company_id     UUID NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000',
+    user_id        UUID NOT NULL DEFAULT '00000000-0000-0000-0000-000000000000',
+    model          TEXT NOT NULL DEFAULT '',
+    role           TEXT NOT NULL DEFAULT 'other',
+    calls          BIGINT NOT NULL DEFAULT 0,
+    failed_calls   BIGINT NOT NULL DEFAULT 0,
+    prompt_tokens        BIGINT NOT NULL DEFAULT 0,
+    cached_prompt_tokens BIGINT NOT NULL DEFAULT 0,
+    completion_tokens    BIGINT NOT NULL DEFAULT 0,
+    total_tokens         BIGINT NOT NULL DEFAULT 0,
+    cost_micros    BIGINT NOT NULL DEFAULT 0,
+    updated_at     TIMESTAMPTZ NOT NULL DEFAULT now(),
+    PRIMARY KEY (day, company_id, user_id, model, role)
+);
+
+-- No FK to companies/users: cost history must survive a tenant or user being
+-- deleted, otherwise the yearly total silently drops.
+
+CREATE INDEX IF NOT EXISTS ai_usage_daily_company_day_idx
+  ON ai_usage_daily (company_id, day DESC);
+
+CREATE INDEX IF NOT EXISTS ai_usage_daily_user_day_idx
+  ON ai_usage_daily (user_id, day DESC);
+
+CREATE INDEX IF NOT EXISTS ai_usage_daily_day_idx
+  ON ai_usage_daily (day DESC);
+
+-- +goose Down
+DROP TABLE IF EXISTS ai_usage_daily;
+DROP TABLE IF EXISTS ai_model_prices;