Improving query speed

Adding conditions in order to not query entries that end before the calendar we are viewing, or start after the calendar that we are viewing.

app/controllers/calendar_controller.rb

@@ -198,8 +198,8 @@ def get_events
     if fuser.blank?
       holidays = Holiday.where(['((holidays.start <= ? AND holidays.'+( ActiveRecord::Base.connection.adapter_name.downcase == 'sqlserver' ? '[end]' : 'end' )+' >= ?) OR (holidays.start BETWEEN ? AND ?)  OR (holidays.'+( ActiveRecord::Base.connection.adapter_name.downcase == 'sqlserver' ? '[end]' : 'end' )+' BETWEEN ? AND ?))',fbegin.to_s,fend.to_s,fbegin.to_s,fend.to_s,fbegin.to_s,fend.to_s]).where(holidays_condition) rescue []
       issues = Issue.where(['((issues.start_date <= ? AND issues.due_date >= ?) OR (issues.start_date BETWEEN ? AND ?)  OR (issues.due_date BETWEEN ? AND ?))',fbegin.to_s,fend.to_s,fbegin.to_s,fend.to_s,fbegin.to_s,fend.to_s]).where(issues_condition) rescue []
-      issues2 = Issue.where(['issues.start_date >= ? AND issues.due_date IS NULL',fbegin.to_s]).where(issues_condition) rescue []
-      issues3 = Issue.where(['issues.start_date IS NULL AND issues.due_date <= ?',fend.to_s]).where(issues_condition) rescue []
+      issues2 = Issue.where(['issues.start_date >= ? AND issues.start_date <= ? AND issues.due_date IS NULL',fbegin.to_s,fend.to_s]).where(issues_condition) rescue []
+      issues3 = Issue.where(['issues.start_date IS NULL AND issues.due_date <= ? AND issues.due_date >= ?',fend.to_s,fbegin.to_s]).where(issues_condition) rescue []
       if Setting.plugin_mega_calendar['display_empty_dates'].to_i == 1
         issues4 = Issue.where(['issues.start_date IS NULL AND issues.due_date IS NULL AND (issues.created_on BETWEEN ? AND ?)',fbegin.to_s,fend.to_s]).where(issues_condition) rescue []
       else
@@ -210,8 +210,8 @@ def get_events
       cur_user_ids += User.current.groups.collect{|x| x.id} rescue []
       holidays = Holiday.where(['((holidays.start <= ? AND holidays.'+( ActiveRecord::Base.connection.adapter_name.downcase == 'sqlserver' ? '[end]' : 'end' )+' >= ?) OR (holidays.start BETWEEN ? AND ?)  OR (holidays.'+( ActiveRecord::Base.connection.adapter_name.downcase == 'sqlserver' ? '[end]' : 'end' )+' BETWEEN ? AND ?)) AND (holidays.user_id = ? OR holidays.user_id IS NULL)',fbegin.to_s,fend.to_s,fbegin.to_s,fend.to_s,fbegin.to_s,fend.to_s,User.current.id]).where(holidays_condition) rescue []
       issues = Issue.where(['((issues.start_date <= ? AND issues.due_date >= ?) OR (issues.start_date BETWEEN ? AND ?)  OR (issues.due_date BETWEEN ? AND ?)) AND issues.assigned_to_id IN (?)',fbegin.to_s,fend.to_s,fbegin.to_s,fend.to_s,fbegin.to_s,fend.to_s,cur_user_ids]).where(issues_condition) rescue []
-      issues2 = Issue.where(['issues.start_date >= ? AND issues.due_date IS NULL AND issues.assigned_to_id IN (?)',fbegin.to_s,cur_user_ids]).where(issues_condition) rescue []
-      issues3 = Issue.where(['issues.start_date IS NULL AND issues.due_date <= ? AND issues.assigned_to_id IN (?)',fend.to_s,cur_user_ids]).where(issues_condition) rescue []
+      issues2 = Issue.where(['issues.start_date >= ? AND issues.start_date <= ? AND issues.due_date IS NULL AND issues.assigned_to_id IN (?)',fbegin.to_s,fend.to_s,cur_user_ids]).where(issues_condition) rescue []
+      issues3 = Issue.where(['issues.start_date IS NULL AND issues.due_date <= ? AND issues.due_date >= ? AND issues.assigned_to_id IN (?)',fend.to_s,fbegin.to_s,cur_user_ids]).where(issues_condition).where(issues_condition) rescue []
       issues4 = Issue.where(['issues.start_date IS NULL AND issues.due_date IS NULL AND issues.assigned_to_id IN (?)',cur_user_ids]).where(issues_condition) rescue []
     end
     if Setting.plugin_mega_calendar['display_empty_dates'].to_i == 1