feat: first entities in database

lib/bds/projects/project.ex

@@ -0,0 +1,30 @@
+defmodule BDS.Projects.Project do
+  @moduledoc false
+
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key {:id, :string, autogenerate: false}
+  @foreign_key_type :string
+
+  schema "projects" do
+    field :name, :string
+    field :slug, :string
+    field :description, :string
+    field :data_path, :string
+    field :created_at, :integer
+    field :updated_at, :integer
+    field :is_active, :boolean, default: false
+
+    has_many :posts, BDS.Posts.Post, foreign_key: :project_id
+  end
+
+  def changeset(project, attrs) do
+    project
+    |> cast(attrs, [:id, :name, :slug, :description, :data_path, :created_at, :updated_at, :is_active],
+      empty_values: [nil]
+    )
+    |> validate_required([:id, :name, :slug, :created_at, :updated_at, :is_active])
+    |> unique_constraint(:slug)
+  end
+end