feat: add database migrations and dockerfile for migrations

build/package/migrations/Dockerfile

@@ -0,0 +1,10 @@
+# syntax=docker/dockerfile:1
+FROM migrate/migrate:v4.17.1 AS migrate
+
+FROM alpine:3.20 AS runtime
+
+COPY --from=migrate /usr/local/bin/migrate /usr/local/bin/migrate
+
+COPY db/migrations/ /srv/migrations/
+
+CMD [ "ash" ]

db/migrations/0001_training.down.sql

@@ -0,0 +1,5 @@
+DROP TABLE IF EXISTS training.prices;
+
+DROP TABLE IF EXISTS training.trainings;
+
+DROP SCHEMA IF EXISTS training;

db/migrations/0001_training.up.sql

@@ -0,0 +1,25 @@
+BEGIN;
+
+CREATE SCHEMA IF NOT EXISTS training;
+
+CREATE TABLE IF NOT EXISTS training.trainings (
+                                                id          SERIAL PRIMARY KEY,
+                                                name        varchar(255) NOT NULL,
+                                                days        smallint NOT NULL,
+                                                published   boolean NOT NULL DEFAULT FALSE,
+                                                retired     boolean NOT NULL DEFAULT FALSE
+);
+
+CREATE TABLE IF NOT EXISTS training.prices (
+                                             training_id SERIAL REFERENCES training.trainings(id),
+                                             amount NUMERIC(10,4) NOT NULL,
+                                             currency VARCHAR(3) NOT NULL,
+                                             CONSTRAINT positive_amount CHECK (amount >= 0),
+                                             CONSTRAINT allowed_currencies CHECK (currency IN ('USD', 'EUR', 'CZK')),
+                                             type        VARCHAR(10) NOT NULL,
+                                             CHECK       (type IN ('OPEN', 'CORPORATE')),
+                                             PRIMARY KEY (training_id, currency, type) -- composite primary key
+);
+
+COMMIT;
+