Moving the migrations directory into database for embedding

backend/internal/database/migrations/0010_users.sql

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+CREATE TABLE IF NOT EXISTS users (
+  id INTEGER PRIMARY KEY,
+  userId TEXT DEFAULT (HEX(RANDOMBLOB(4))) NOT NULL UNIQUE,
+  username VARCHAR(255) NOT NULL UNIQUE,
+  password VARCHAR(255) NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS users_username_index ON users (username);
+CREATE INDEX IF NOT EXISTS users_userId_index ON users (userId);

backend/internal/database/migrations/0020_projects.sql

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+CREATE TABLE IF NOT EXISTS projects (
+  id INTEGER PRIMARY KEY,
+  projectId TEXT DEFAULT (HEX(RANDOMBLOB(4))) NOT NULL UNIQUE,
+  name VARCHAR(255) NOT NULL UNIQUE,
+  description TEXT NOT NULL,
+  user_id INTEGER NOT NULL,
+  FOREIGN KEY (user_id) REFERENCES users (id)
+);
+
+CREATE INDEX IF NOT EXISTS projects_projectId_index ON projects (projectId);
+CREATE INDEX IF NOT EXISTS projects_user_id_index ON projects (user_id);

backend/internal/database/migrations/0030_time_reports.sql

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+CREATE TABLE IF NOT EXISTS time_reports (
+  id INTEGER PRIMARY KEY,
+  reportId TEXT DEFAULT (HEX(RANDOMBLOB(6))) NOT NULL UNIQUE,
+  project_id INTEGER NOT NULL,
+  start DATETIME NOT NULL,
+  end DATETIME NOT NULL,
+  FOREIGN KEY (project_id) REFERENCES projects (id) ON DELETE CASCADE
+);
+
+CREATE TRIGGER IF NOT EXISTS time_reports_start_before_end
+  BEFORE INSERT ON time_reports
+  FOR EACH ROW
+  BEGIN
+    SELECT
+      CASE
+        WHEN NEW.start >= NEW.end THEN
+          RAISE (ABORT, 'start must be before end')
+      END;
+  END;

backend/internal/database/migrations/0040_time_report_collections.sql

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+CREATE TABLE IF NOT EXISTS report_collection (
+  id INTEGER PRIMARY KEY,
+  owner_id INTEGER NOT NULL,
+  project_id INTEGER NOT NULL,
+  date DATE NOT NULL,
+  signed_by INTEGER, -- NULL if not signed
+  FOREIGN KEY (owner_id) REFERENCES users (id)
+  FOREIGN KEY (signed_by) REFERENCES users (id)
+);

backend/internal/database/migrations/0050_user_roles.sql

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+CREATE TABLE IF NOT EXISTS user_roles (
+  user_id INTEGER NOT NULL,
+  project_id INTEGER NOT NULL,
+  role STRING NOT NULL, -- 'admin' or 'member'
+  FOREIGN KEY (user_id) REFERENCES users (id)
+  FOREIGN KEY (project_id) REFERENCES projects (id)
+);

backend/internal/database/migrations/README.md

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+# Database migrations
+
+This directory contains all the database migrations for the backend.  
+
+[!WARNING]
+Keep in mind that these migrations are **not yet stable**.
+
+## Running migrations
+
+In the root of the backend directory, run:
+
+```bash
+make migrate
+```