FEATURE: start tracking information about migrations that run

This commit adds a new tracking table that lets us know

- When a migration ran
- What version Discourse was at
- How long it took
- What version Rails was at

The built in tracking in Rails is very limited, does not track this info

db/migrate/20000225050318_add_schema_migration_details.rb

@@ -0,0 +1,30 @@
+class AddSchemaMigrationDetails < ActiveRecord::Migration
+  def up
+    # schema_migrations table is way too thin, does not give info about
+    # duration of migration or the date it happened, this migration together with the
+    # monkey patch adds a lot of information to the migration table
+
+    create_table :schema_migration_details do |t|
+      t.string :version, null: false
+      t.string :name
+      t.string :hostname
+      t.string :git_version
+      t.string :rails_version
+      t.integer :duration
+      t.string :direction # this really should be a pg enum type but annoying to wire up for little gain
+      t.datetime :created_at, null: false
+    end
+
+    add_index :schema_migration_details, [:version]
+
+    execute("INSERT INTO schema_migration_details(version, created_at)
+             SELECT version, current_timestamp
+             FROM schema_migrations
+             ORDER BY version
+            ")
+  end
+
+  def down
+    drop_table :schema_migration_details
+  end
+end