db: Use proper Word64 support

This commit uses a version of persistent that has been modified to add proper Word64 support. Previously when the schema used `Word64` as the column type, Persistent would use `SqlInt64` as the SQL representation which means that `Word64` values above `maxBound :: Int64` would be stored as negative values in the database. That is fine for a database only accessed from Haskell but is a pain in the neck when the database is used as an interop layer for other languages.
IntersectMBO · Jul 5, 2020 · f10ee45 · f10ee45
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diff --git a/cabal.project b/cabal.project
@@ -362,3 +362,36 @@ source-repository-package
   tag: 1e0f1a27ff5f6e1a4108b42137c95675b33ffa74
   --sha256: 189jgn0zlg885i4kabdm714wmk9dp3lxa78a9ryv0azq0rbl5my4
   subdir: cardano-config
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+-- -----------------------------------------------------------------------------
+-- Proper support for Word64
+
+-- Allows esqueleto to use a new version of persistent.
+allow-newer: persistent
+
+source-repository-package
+  type: git
+  location: https://github.com/input-output-hk/persistent
+  tag: f56f1a2522741bcbc871d9d864e5365d38507a74
+  --sha256: 0000000000000000000000000000000000000000000000000000
+  subdir: persistent
+
+source-repository-package
+  type: git
+  location: https://github.com/input-output-hk/persistent
+  tag: f56f1a2522741bcbc871d9d864e5365d38507a74
+  --sha256: 0000000000000000000000000000000000000000000000000000
+  subdir: persistent-postgresql
+
+source-repository-package
+  type: git
+  location: https://github.com/input-output-hk/persistent
+  tag: f56f1a2522741bcbc871d9d864e5365d38507a74
+  --sha256: 0000000000000000000000000000000000000000000000000000
+  subdir: persistent-template
diff --git a/schema/migration-2-0003-20200702.sql b/schema/migration-2-0003-20200702.sql