Set Max Name Length

TIL Postgres has a maximum table name length of 63 characters. I set an
upper bound of 58 on the name length of the MetaChangeset. Why 58 and
not 63? Because when we create the materialized view for the data set we
tack on "_view" to the table name.

Updates #235

lib/plenario/actions/data_set_actions.ex

@@ -129,6 +129,9 @@ defmodule Plenario.Actions.DataSetActions do
   @copy "db-actions/etl/copy.sql.eex"
   @refresh_view "db-actions/etl/refresh-view.sql.eex"
 
+  #            ms     s    m
+  @etl_timeout 1000 * 60 * 20
+
   def etl!(%Meta{id: meta_id}, download_path), do: etl!(meta_id, download_path)
   def etl!(meta_id, download_path) do
     meta = MetaActions.get(meta_id)
@@ -150,13 +153,14 @@ defmodule Plenario.Actions.DataSetActions do
     sql_stream = Ecto.Adapters.SQL.stream(Repo, cmd)
     file_stream = File.stream!(download_path, [:utf8])
 
-    Repo.transaction fn ->
+    Repo.transaction(fn ->
       execute! @truncate_table, table_name: table_name
-
-      Repo.transaction(fn -> Enum.into(file_stream, sql_stream) end)
-
+      # set the load to infinite time out knowing that the surrounding timeout will
+      # terminate. this needs to be bumped because the default time out is 2 minutes,
+      # which for many data sets is far too short to load the entire document.
+      Repo.transaction(fn -> Enum.into(file_stream, sql_stream) end, timeout: :infinity)
       execute! @refresh_view, view_name: view_name
-    end
+    end, timeout: @etl_timeout)
 
     :ok
   end

lib/plenario/changesets/meta_changesets.ex

@@ -57,6 +57,7 @@ defmodule Plenario.Changesets.MetaChangesets do
     |> validate_required(@required_keys)
     |> unique_constraint(:source_url)
     |> unique_constraint(:name)
+    |> validate_length(:name, max: 58)
     |> cast_assoc(:user)
     |> test_source_url()
     |> validate_source_type()
@@ -71,6 +72,7 @@ defmodule Plenario.Changesets.MetaChangesets do
     |> validate_required(@required_keys)
     |> unique_constraint(:source_url)
     |> unique_constraint(:name)
+    |> validate_length(:name, max: 58)
     |> cast_assoc(:user)
     |> validate_state()
     |> test_source_url()
@@ -79,6 +81,7 @@ defmodule Plenario.Changesets.MetaChangesets do
     |> validate_refresh_interval()
     |> validate_refresh_ends_on()
     |> set_slug()
+    |> set_table_name()
   end
 
   defp validate_state(%Ecto.Changeset{valid?: true, changes: changes} = changeset) do