feat: Add reporting events rollup database migration and model

app/models/reporting_event_rollup.rb

@@ -0,0 +1,48 @@
+# == Schema Information
+#
+# Table name: reporting_events_rollups
+#
+#  id                        :bigint           not null, primary key
+#  count                     :bigint           default(0), not null
+#  date                      :date             not null
+#  dimension_id              :bigint           not null
+#  dimension_type            :string           not null
+#  metric                    :string           not null
+#  sum_value                 :float            default(0.0), not null
+#  sum_value_business_hours  :float            default(0.0), not null
+#  created_at                :datetime         not null
+#  updated_at                :datetime         not null
+#  account_id                :integer          not null
+#
+# Indexes
+#
+#  index_rollup_summary     (account_id,dimension_type,date)
+#  index_rollup_timeseries  (account_id,metric,date)
+#  index_rollup_unique_key  (account_id,date,dimension_type,dimension_id,metric) UNIQUE
+#
+
+class ReportingEventRollup < ApplicationRecord
+  belongs_to :account
+
+  # Store string values directly in the database for better readability and debugging
+  enum :dimension_type, %w[account agent inbox team].index_by(&:itself)
+  enum :metric, %w[
+    resolutions_count
+    first_response
+    resolution_time
+    reply_time
+    bot_resolutions_count
+    bot_handoffs_count
+  ].index_by(&:itself)
+
+  validates :account_id, presence: true
+  validates :date, presence: true
+  validates :dimension_type, presence: true
+  validates :dimension_id, presence: true
+  validates :metric, presence: true
+  validates :count, numericality: { greater_than_or_equal_to: 0 }
+
+  scope :for_date_range, ->(start_date, end_date) { where(date: start_date..end_date) }
+  scope :for_dimension, ->(type, id) { where(dimension_type: type, dimension_id: id) }
+  scope :for_metric, ->(metric) { where(metric: metric) }
+end

db/migrate/20260211145813_create_reporting_events_rollup.rb

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+class CreateReportingEventsRollup < ActiveRecord::Migration[7.1]
+  disable_ddl_transaction!
+
+  def change
+    create_table :reporting_events_rollups do |t|
+      t.integer :account_id, null: false
+      t.date :date, null: false
+      t.string :dimension_type, null: false
+      t.bigint :dimension_id, null: false
+      t.string :metric, null: false
+      t.bigint :count, default: 0, null: false
+      t.float :sum_value, default: 0.0, null: false
+      t.float :sum_value_business_hours, default: 0.0, null: false
+
+      t.timestamps
+    end
+
+    # Unique index for upsert conflict resolution
+    add_index :reporting_events_rollups,
+              [:account_id, :date, :dimension_type, :dimension_id, :metric],
+              unique: true,
+              name: 'index_rollup_unique_key'
+
+    # Query index for timeseries (date range scans)
+    add_index :reporting_events_rollups,
+              [:account_id, :metric, :date],
+              name: 'index_rollup_timeseries'
+
+    # Query index for summaries (dimension scans)
+    add_index :reporting_events_rollups,
+              [:account_id, :dimension_type, :date],
+              name: 'index_rollup_summary'
+  end
+end