chore/laget-databaseskjema

backend/db/migrations/001_create_tables.sql

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+-- 001_create_tables.sql
+-- Wine not? – tabeller og typer for PostgreSQL
+-- Kjør med:  psql -d winenot -v ON_ERROR_STOP=1 -f backend/db/migrations/001_create_tables.sql
+-- En migrasjon som er merget, endres ikke. Nye endringer legges i en ny, nummerert fil.
+
+BEGIN;
+
+-- ---------- Typer ----------
+-- Verdiene er de samme som i X-Wines, og rekkefølgen her bestemmer sorteringen.
+
+CREATE TYPE body_level AS ENUM (
+  'Very light-bodied',
+  'Light-bodied',
+  'Medium-bodied',
+  'Full-bodied',
+  'Very full-bodied'
+);
+
+CREATE TYPE acidity_level AS ENUM (
+  'Low',
+  'Medium',
+  'High'
+);
+
+-- ---------- Oppslagstabeller ----------
+
+CREATE TABLE countries (
+  code text PRIMARY KEY,                  -- Code fra X-Wines, f.eks. 'FR'
+  name text NOT NULL UNIQUE
+);
+
+CREATE TABLE regions (
+  id           integer PRIMARY KEY,       -- RegionID fra X-Wines
+  name         text NOT NULL,
+  country_code text NOT NULL REFERENCES countries(code)
+);
+
+CREATE TABLE wineries (
+  id      integer PRIMARY KEY,            -- WineryID fra X-Wines
+  name    text NOT NULL,
+  website text
+);
+
+CREATE TABLE grapes (
+  id   integer GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  name text NOT NULL UNIQUE
+);
+
+CREATE TABLE foods (
+  id   integer GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  name text NOT NULL UNIQUE               -- verdier fra Harmonize, f.eks. 'Beef', 'Rich Fish'
+);
+
+-- ---------- Viner ----------
+
+CREATE TABLE wines (
+  id           integer PRIMARY KEY,       -- WineID fra X-Wines
+  name         text NOT NULL,
+  type         text NOT NULL,             -- Red, White, Rosé, Sparkling, Dessert, Dessert/Port
+  elaborate    text,                      -- f.eks. 'Varietal/100%', 'Assemblage/Blend'
+  abv          numeric(4,1),              -- alkoholprosent
+  body         body_level,
+  acidity      acidity_level,
+  winery_id    integer NOT NULL REFERENCES wineries(id),
+  region_id    integer NOT NULL REFERENCES regions(id),
+  country_code text    NOT NULL REFERENCES countries(code), -- bevisst duplisert fra regions: sparer en join ved landfilter
+  vintages     integer[] NOT NULL DEFAULT '{}',             -- 'N.V.' hoppes over i importskriptet
+  avg_rating   numeric(3,2),              -- forhåndsberegnet i importskriptet
+  rating_count integer NOT NULL DEFAULT 0
+);
+
+-- ---------- Mange-til-mange ----------
+
+CREATE TABLE wine_grapes (
+  wine_id  integer NOT NULL REFERENCES wines(id)  ON DELETE CASCADE,
+  grape_id integer NOT NULL REFERENCES grapes(id) ON DELETE CASCADE,
+  PRIMARY KEY (wine_id, grape_id)
+);
+
+CREATE TABLE wine_foods (
+  wine_id integer NOT NULL REFERENCES wines(id) ON DELETE CASCADE,
+  food_id integer NOT NULL REFERENCES foods(id) ON DELETE CASCADE,
+  PRIMARY KEY (wine_id, food_id)
+);
+
+-- ---------- Brukere og favoritter (brukergenerert data) ----------
+
+CREATE TABLE users (
+  id            integer GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  username      text NOT NULL UNIQUE,
+  email         text NOT NULL UNIQUE,
+  password_hash text NOT NULL,            -- aldri klartekst; hashes med bcrypt/argon2 i backend
+  created_at    timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE TABLE favorites (
+  user_id    integer NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  wine_id    integer NOT NULL REFERENCES wines(id) ON DELETE CASCADE,
+  created_at timestamptz NOT NULL DEFAULT now(),
+  PRIMARY KEY (user_id, wine_id)          -- hindrer duplikater og dekker "mine favoritter"
+);
+
+COMMIT;

backend/db/migrations/002_create_indexes.sql

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+-- 002_create_indexes.sql
+-- Wine not? – indekser for søk, filtrering og sortering
+-- Kjør med:  psql -d winenot -v ON_ERROR_STOP=1 -f backend/db/migrations/002_create_indexes.sql
+
+BEGIN;
+
+CREATE EXTENSION IF NOT EXISTS pg_trgm;   -- raskt delstreng-søk på vinnavn
+
+-- Søk: WHERE name ILIKE '%tekst%'
+CREATE INDEX wines_name_trgm_idx ON wines USING gin (name gin_trgm_ops);
+
+-- Filtre
+CREATE INDEX wines_type_idx     ON wines (type);
+CREATE INDEX wines_country_idx  ON wines (country_code);
+CREATE INDEX wines_region_idx   ON wines (region_id);
+CREATE INDEX wines_winery_idx   ON wines (winery_id);
+CREATE INDEX wines_taste_idx    ON wines (body, acidity);      -- Explore by taste
+CREATE INDEX wines_vintages_idx ON wines USING gin (vintages); -- WHERE vintages @> ARRAY[2018]
+
+-- Sortering (id som siste ledd gir stabil rekkefølge ved paginering)
+CREATE INDEX wines_name_sort_idx ON wines (name, id);
+CREATE INDEX wines_rating_idx    ON wines (avg_rating DESC NULLS LAST, id);
+CREATE INDEX wines_abv_idx       ON wines (abv, id);
+
+-- Primærnøklene dekker oppslag fra vin/bruker. Disse dekker motsatt vei.
+CREATE INDEX wine_grapes_grape_idx ON wine_grapes (grape_id);
+CREATE INDEX wine_foods_food_idx   ON wine_foods (food_id);
+CREATE INDEX favorites_wine_idx    ON favorites (wine_id);
+CREATE INDEX regions_country_idx   ON regions (country_code);
+
+COMMIT;