LLM cost estimation (#223)

* Password reset back button also after confirmation

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>

* Implement a filter for category (#215)

- Also implement an is empty/is null condition.

* Implement an LLM cost estimation page

Track costs across all the cost categories: auto categorization, auto merchant detection and chat.
Show warning with estimated cost when running a rule that contains AI.

* Update pricing

* Add google pricing

and fix inferred model everywhere.

* Update app/models/llm_usage.rb

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: soky srm <sokysrm@gmail.com>

* FIX address review

* Linter

* Address review

- Lowered log level
- extracted the duplicated record_usage method into a shared concern

* Update app/controllers/settings/llm_usages_controller.rb

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: soky srm <sokysrm@gmail.com>

* Moved attr_reader out of private

---------

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>
Signed-off-by: soky srm <sokysrm@gmail.com>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

app/controllers/rules_controller.rb

@@ -38,6 +38,20 @@ class RulesController < ApplicationController
   end
 
   def confirm
+    # Compute provider, model, and cost estimation for auto-categorize actions
+    if @rule.actions.any? { |a| a.action_type == "auto_categorize" }
+      # Use the same provider determination logic as Family::AutoCategorizer
+      llm_provider = Provider::Registry.get_provider(:openai)
+
+      if llm_provider
+        @selected_model = Provider::Openai.effective_model
+        @estimated_cost = LlmUsage.estimate_auto_categorize_cost(
+          transaction_count: @rule.affected_resource_count,
+          category_count: @rule.family.categories.count,
+          model: @selected_model
+        )
+      end
+    end
   end
 
   def edit

app/controllers/settings/llm_usages_controller.rb

@@ -0,0 +1,35 @@
+class Settings::LlmUsagesController < ApplicationController
+  layout "settings"
+
+  def show
+    @breadcrumbs = [
+      [ "Home", root_path ],
+      [ "LLM Usage", nil ]
+    ]
+    @family = Current.family
+
+    # Get date range from params or default to last 30 days
+    def safe_parse_date(s)
+      Date.iso8601(s)
+    rescue ArgumentError, TypeError
+      nil
+    end
+
+    private
+
+    @end_date  = safe_parse_date(params[:end_date])  || Date.today
+    @start_date = safe_parse_date(params[:start_date]) || (@end_date - 30.days)
+    if @start_date > @end_date
+      @start_date, @end_date = @end_date - 30.days, @end_date
+    end
+
+    # Get usage data
+    @llm_usages = @family.llm_usages
+                         .for_date_range(@start_date.beginning_of_day, @end_date.end_of_day)
+                         .recent
+                         .limit(100)
+
+    # Get statistics
+    @statistics = LlmUsage.statistics_for_family(@family, start_date: @start_date.beginning_of_day, end_date: @end_date.end_of_day)
+  end
+end