feat: Add migration files for assignment v2 (#12147)

Co-authored-by: Pranav <pranav@chatwoot.com>

db/migrate/20250806140000_create_assignment_policies.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class CreateAssignmentPolicies < ActiveRecord::Migration[7.1]
+  def change
+    create_table :assignment_policies do |t|
+      t.references :account, null: false, index: true
+      t.string :name, null: false, limit: 255
+      t.text :description
+      t.integer :assignment_order, null: false, default: 0 # 0: round_robin, 1: balanced
+      t.integer :conversation_priority, null: false, default: 0 # 0: earliest_created, 1: longest_waiting
+      t.integer :fair_distribution_limit, null: false, default: 100
+      t.integer :fair_distribution_window, null: false, default: 3600 # seconds
+      t.boolean :enabled, null: false, default: true
+
+      t.timestamps
+    end
+
+    add_index :assignment_policies, [:account_id, :name], unique: true
+    add_index :assignment_policies, :enabled
+  end
+end

db/migrate/20250806140001_create_inbox_assignment_policies.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class CreateInboxAssignmentPolicies < ActiveRecord::Migration[7.1]
+  def change
+    create_table :inbox_assignment_policies do |t|
+      t.references :inbox, null: false, index: { unique: true }
+      t.references :assignment_policy, null: false, index: true
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20250806140002_create_agent_capacity_policies.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class CreateAgentCapacityPolicies < ActiveRecord::Migration[7.1]
+  def change
+    create_table :agent_capacity_policies do |t|
+      t.references :account, null: false, index: true
+      t.string :name, null: false, limit: 255
+      t.text :description
+      t.jsonb :exclusion_rules, default: {}, null: false
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20250806140003_create_inbox_capacity_limits.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class CreateInboxCapacityLimits < ActiveRecord::Migration[7.1]
+  def change
+    create_table :inbox_capacity_limits do |t|
+      t.references :agent_capacity_policy, null: false, index: true
+      t.references :inbox, null: false, index: true
+      t.integer :conversation_limit, null: false
+
+      t.timestamps
+    end
+
+    add_index :inbox_capacity_limits, [:agent_capacity_policy_id, :inbox_id], unique: true
+  end
+end

db/migrate/20250806140004_add_agent_capacity_policy_to_account_users.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddAgentCapacityPolicyToAccountUsers < ActiveRecord::Migration[7.1]
+  def change
+    add_reference :account_users, :agent_capacity_policy, null: true, index: true
+  end
+end

db/migrate/20250806140005_create_leaves.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class CreateLeaves < ActiveRecord::Migration[7.1]
+  def change
+    create_table :leaves do |t|
+      t.references :account, null: false
+      t.references :user, null: false
+      t.date :start_date, null: false
+      t.date :end_date, null: false
+      t.integer :leave_type, null: false, default: 0
+      t.integer :status, null: false, default: 0
+      t.text :reason
+      t.references :approved_by
+      t.datetime :approved_at
+
+      t.timestamps
+    end
+
+    add_index :leaves, [:account_id, :status]
+  end
+end