docs(web): add reverse-engineered db/schema.sql

No migration shipped in the export. Recreates production_tasks and
time_logs (columns derived from the API queries) so the backend can run
against a fresh self-hosted Postgres.

apps/web/db/schema.sql

@@ -0,0 +1,35 @@
+-- Database schema for the insole-production time tracker (apps/web backend).
+--
+-- This file was reverse-engineered from the API route queries — the original
+-- Create/Anything export shipped no migration. Run it once against a fresh
+-- Postgres database (Neon or local) to create the two application tables the
+-- app needs:
+--
+--   psql "$DATABASE_URL" -f apps/web/db/schema.sql
+--
+-- Auth (better-auth user/session/account/verification tables) is NOT created
+-- here. The core flow — tasks, stopwatch, history, CSV export — does not check
+-- a session, so auth is optional for local development. If you do want sign-in,
+-- generate those tables separately with: npx @better-auth/cli migrate
+
+CREATE TABLE IF NOT EXISTS production_tasks (
+  id           integer GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  name         text NOT NULL,
+  insole_types text[] NOT NULL DEFAULT ARRAY['Kurk', 'Berk', '3D']::text[],
+  created_at   timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS time_logs (
+  id               integer GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  task_id          integer NOT NULL REFERENCES production_tasks(id) ON DELETE CASCADE,
+  start_time       timestamptz NOT NULL,
+  end_time         timestamptz,
+  duration_seconds integer NOT NULL DEFAULT 0,
+  pair_count       integer NOT NULL DEFAULT 2,   -- "number of insoles" for the session
+  insole_type      text,                          -- 'Kurk' | 'Berk' | '3D'
+  notes            text,
+  created_at       timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS time_logs_task_id_idx    ON time_logs (task_id);
+CREATE INDEX IF NOT EXISTS time_logs_start_time_idx ON time_logs (start_time DESC);