diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
index 905feb5..ec0fe92 100644
--- a/CHANGELOG.rdoc
+++ b/CHANGELOG.rdoc
@@ -4,6 +4,7 @@ KalibroProcessor is the processing web service for Mezuro.
 
 == Unreleased
 
+* Remove timestamp columns from KalibroModule, ModuleResult, MetricResult and ProcessTime
 * Transform TreeMetricResult#descendant_values into a single query for performance
 * Fix possible inconsistency in module result creation (lack of transaction)
 * Improve acceptance tests by fixing small bugs and adding processing times
diff --git a/db/migrate/20160716000521_remove_timestamps_from_module_results.rb b/db/migrate/20160716000521_remove_timestamps_from_module_results.rb
new file mode 100644
index 0000000..eadb25b
--- /dev/null
+++ b/db/migrate/20160716000521_remove_timestamps_from_module_results.rb
@@ -0,0 +1,6 @@
+class RemoveTimestampsFromModuleResults < ActiveRecord::Migration
+  def change
+    remove_column :module_results, :created_at, :string
+    remove_column :module_results, :updated_at, :string
+  end
+end
diff --git a/db/migrate/20160716000528_remove_timestamps_from_metric_results.rb b/db/migrate/20160716000528_remove_timestamps_from_metric_results.rb
new file mode 100644
index 0000000..4401fa0
--- /dev/null
+++ b/db/migrate/20160716000528_remove_timestamps_from_metric_results.rb
@@ -0,0 +1,6 @@
+class RemoveTimestampsFromMetricResults < ActiveRecord::Migration
+  def change
+    remove_column :metric_results, :created_at, :string
+    remove_column :metric_results, :updated_at, :string
+  end
+end
diff --git a/db/migrate/20160716000530_remove_timestamps_from_kalibro_modules.rb b/db/migrate/20160716000530_remove_timestamps_from_kalibro_modules.rb
new file mode 100644
index 0000000..e7d2abe
--- /dev/null
+++ b/db/migrate/20160716000530_remove_timestamps_from_kalibro_modules.rb
@@ -0,0 +1,6 @@
+class RemoveTimestampsFromKalibroModules < ActiveRecord::Migration
+  def change
+    remove_column :kalibro_modules, :created_at, :string
+    remove_column :kalibro_modules, :updated_at, :string
+  end
+end
diff --git a/db/migrate/20160720183503_remove_timestamps_from_process_times.rb b/db/migrate/20160720183503_remove_timestamps_from_process_times.rb
new file mode 100644
index 0000000..45dcf64
--- /dev/null
+++ b/db/migrate/20160720183503_remove_timestamps_from_process_times.rb
@@ -0,0 +1,6 @@
+class RemoveTimestampsFromProcessTimes < ActiveRecord::Migration
+  def change
+    remove_column :process_times, :created_at, :string
+    remove_column :process_times, :updated_at, :string
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index f576490..e89e753 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20151002172231) do
+ActiveRecord::Schema.define(version: 20160720183503) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -33,43 +33,35 @@
   add_index "delayed_jobs", ["priority", "run_at"], name: "delayed_jobs_priority", using: :btree
 
   create_table "kalibro_modules", force: :cascade do |t|
-    t.string   "long_name",        limit: 255
-    t.string   "granularity",      limit: 255
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer  "module_result_id"
+    t.string  "long_name",        limit: 255
+    t.string  "granularity",      limit: 255
+    t.integer "module_result_id"
   end
 
   create_table "metric_results", force: :cascade do |t|
-    t.integer  "module_result_id"
-    t.integer  "metric_configuration_id"
-    t.float    "value"
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.string   "type",                              default: "MetricResult", null: false
-    t.integer  "line_number"
-    t.text     "message"
-    t.integer  "related_hotspot_metric_results_id"
+    t.integer "module_result_id"
+    t.integer "metric_configuration_id"
+    t.float   "value"
+    t.string  "type",                              default: "MetricResult", null: false
+    t.integer "line_number"
+    t.text    "message"
+    t.integer "related_hotspot_metric_results_id"
   end
 
   add_index "metric_results", ["related_hotspot_metric_results_id"], name: "index_metric_results_on_related_hotspot_metric_results_id", using: :btree
 
   create_table "module_results", force: :cascade do |t|
-    t.float    "grade"
-    t.integer  "parent_id"
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer  "processing_id"
+    t.float   "grade"
+    t.integer "parent_id"
+    t.integer "processing_id"
   end
 
   add_index "module_results", ["parent_id"], name: "index_module_results_on_parent_id", using: :btree
 
   create_table "process_times", force: :cascade do |t|
-    t.string   "state",         limit: 255
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer  "processing_id"
-    t.float    "time"
+    t.string  "state",         limit: 255
+    t.integer "processing_id"
+    t.float   "time"
   end
 
   create_table "processings", force: :cascade do |t|
diff --git a/spec/factories/process_times.rb b/spec/factories/process_times.rb
index adbdb29..2d11215 100644
--- a/spec/factories/process_times.rb
+++ b/spec/factories/process_times.rb
@@ -2,7 +2,5 @@
   factory :process_time do
     sequence(:id, 1)
     state "MyString"
-    created_at "2014-07-31T08:58:07+00:00"
-    updated_at "2014-07-31T09:12:01+00:00"
   end
 end