Add geo areas schema

db/migrate/20181010183331_create_geo_areas.rb

@@ -0,0 +1,14 @@
+class CreateGeoAreas < ActiveRecord::Migration[5.2]
+  def change
+    create_table :geo_areas do |t|
+      t.string :source, index: true
+
+      t.jsonb :geometry
+      t.jsonb :properties
+
+      t.references :champ, foreign_key: true, index: true
+    end
+
+    add_column :types_de_champ, :options, :jsonb
+  end
+end