Try an explicit database close to flush resources

Stackage/Database.hs

@@ -4,6 +4,7 @@ module Stackage.Database
     , SnapName (..)
     , SnapshotId ()
     , Snapshot (..)
+    , closeStackageDatabase
     , newestSnapshot
     , newestLTS
     , newestLTSMajor
@@ -73,6 +74,7 @@ import qualified Database.Esqueleto as E
 import Data.Yaml (decode)
 import qualified Data.Aeson as A
 import Types (SnapshotBranch(..))
+import Data.Pool (destroyAllResources)
 
 currentSchema :: Int
 currentSchema = 1
@@ -153,6 +155,9 @@ _hideUnusedWarnings _ = ()
 
 newtype StackageDatabase = StackageDatabase ConnectionPool
 
+closeStackageDatabase :: StackageDatabase -> IO ()
+closeStackageDatabase (StackageDatabase pool) = destroyAllResources pool
+
 class MonadIO m => GetStackageDatabase m where
     getStackageDatabase :: m StackageDatabase
 instance MonadIO m => GetStackageDatabase (ReaderT StackageDatabase m) where

Stackage/Database/Cron.hs

@@ -106,6 +106,7 @@ loadFromS3 develMode man = do
                     -- give existing users a chance to clean up
                     threadDelay $ 1000000 * 30
                     void $ tryIO $ removeFile (fromString fp)
+                    closeStackageDatabase db
                 return oldKill
 
     update

stackage-server.cabal

@@ -184,6 +184,7 @@ library
                   , amazonka-s3                   >= 1.3         &&   < 1.5
                   , lens                          >= 4.13        &&   < 4.14
                   , file-embed
+                  , resource-pool
 
 executable         stackage-server
     if flag(library-only)