store SHA-1 hashes for *all* semver tags, since we are no longer using that as a proxy for symbol graph state

Author: tayloraswift

Sources/UnidocDB/Packages/PackageDatabase.Editions.swift

@@ -111,12 +111,10 @@ extension PackageDatabase.Editions
         version:SemanticVersion,
         with session:Mongo.Session) async throws -> Int32?
     {
-        //  We use the SHA-1 hash as “proof” that the edition has at least one symbol graph.
-        //  Therefore, merely registering tags does not update hashes.
         let placement:Placement = try await self.register(package: package,
             version: version,
             refname: tag.name,
-            sha1: nil,
+            sha1: tag.hash,
             with: session)
 
         return placement.new ? placement.coordinate : nil
@@ -152,24 +150,12 @@ extension PackageDatabase.Editions
         {
             switch placement.sha1
             {
-            case nil:
-                //  If the edition would gain a hash, we should update it.
-
-                //  FIXME: this can race another update, in which case we will store an
-                //  arbitrary choice of hash without marking the edition dirty.
-                //  We should use `placement.sha1` as a hint to skip the update only,
-                //  and set the dirty flag within a custom update statement.
-                try await self.update(some: edition, with: session)
-
             case sha1?:
                 //  Nothing to do.
                 break
 
-            case _?:
-                try await self.update(field: PackageEdition[.lost],
-                    of: edition.id,
-                    to: true,
-                    with: session)
+            case _:
+                try await self.update(some: edition, with: session)
             }
         }