Fix ASOS upsert timeout: infinite tx timeout, bump prod pool to 20

458K-record upsert held a connection for the entire transaction,
exceeding the 15s Postgrex timeout on prod. Set transaction timeout
to infinity and increase prod pool from 10 to 20.

config/runtime.exs

@@ -49,7 +49,7 @@ if config_env() == :prod do
   config :microwaveprop, Microwaveprop.Repo,
     # ssl: true,
     url: database_url,
-    pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10"),
+    pool_size: String.to_integer(System.get_env("POOL_SIZE") || "20"),
     # For machines with several cores, consider starting multiple pools of `pool_size`
     # pool_count: 4,
     socket_options: maybe_ipv6

lib/microwaveprop/propagation.ex

@@ -77,19 +77,22 @@ defmodule Microwaveprop.Propagation do
       end)
 
     result =
-      Repo.transaction(fn ->
-        entries
-        |> Enum.chunk_every(500)
-        |> Enum.reduce(0, fn chunk, acc ->
-          {count, _} =
-            Repo.insert_all(GridScore, chunk,
-              on_conflict: {:replace, [:score, :factors, :updated_at]},
-              conflict_target: [:lat, :lon, :valid_time, :band_mhz]
-            )
+      Repo.transaction(
+        fn ->
+          entries
+          |> Enum.chunk_every(500)
+          |> Enum.reduce(0, fn chunk, acc ->
+            {count, _} =
+              Repo.insert_all(GridScore, chunk,
+                on_conflict: {:replace, [:score, :factors, :updated_at]},
+                conflict_target: [:lat, :lon, :valid_time, :band_mhz]
+              )
 
-          acc + count
-        end)
-      end)
+            acc + count
+          end)
+        end,
+        timeout: :infinity
+      )
 
     case result do
       {:ok, _count} -> prune_old_scores()