feat: Initial observations endpoint

db/migrate/20260216224032_create_observations.rb

@@ -0,0 +1,8 @@
+class CreateObservations < ActiveRecord::Migration[8.1]
+  def change
+    create_table :observations do |t|
+      t.jsonb :request_body
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -0,0 +1,22 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# This file is the source Rails uses to define your schema when running `bin/rails
+# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema[8.1].define(version: 2026_02_16_224032) do
+  # These are extensions that must be enabled in order to support this database
+  enable_extension "pg_catalog.plpgsql"
+
+  create_table "observations", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.jsonb "request_body"
+    t.datetime "updated_at", null: false
+  end
+end