For those having the issues POST-MIGRATION from SQLite run the following:
select setval('public."AutoTagging_Id_seq"',(SELECT MAX("Id")+1 FROM "AutoTagging"));
select setval('public."Blacklist_Id_seq"',(SELECT MAX("Id")+1 FROM "Blocklist"));
select setval('public."Commands_Id_seq"',(SELECT MAX("Id")+1 FROM "Commands"));
select setval('public."Config_Id_seq"',(SELECT MAX("Id")+1 FROM "Config"));
select setval('public."CustomFilters_Id_seq"',(SELECT MAX("Id")+1 FROM "CustomFilters"));
select setval('public."CustomFormats_Id_seq"',(SELECT MAX("Id")+1 FROM "CustomFormats"));
select setval('public."DelayProfiles_Id_seq"',(SELECT MAX("Id")+1 FROM "DelayProfiles"));
select setval('public."DownloadClientStatus_Id_seq"',(SELECT MAX("Id")+1 FROM "DownloadClientStatus"));
select setval('public."DownloadClients_Id_seq"',(SELECT MAX("Id")+1 FROM "DownloadClients"));
select setval('public."DownloadHistory_Id_seq"',(SELECT MAX("Id")+1 FROM "DownloadHistory"));
select setval('public."EpisodeFiles_Id_seq"',(SELECT MAX("Id")+1 FROM "EpisodeFiles"));
select setval('public."Episodes_Id_seq"',(SELECT MAX("Id")+1 FROM "Episodes"));
select setval('public."ExtraFiles_Id_seq"',(SELECT MAX("Id")+1 FROM "ExtraFiles"));
select setval('public."History_Id_seq"',(SELECT MAX("Id")+1 FROM "History"));
select setval('public."ImportListExclusions_Id_seq"',(SELECT MAX("Id")+1 FROM "ImportListExclusions"));
select setval('public."ImportListStatus_Id_seq"',(SELECT MAX("Id")+1 FROM "ImportListStatus"));
select setval('public."ImportLists_Id_seq"',(SELECT MAX("Id")+1 FROM "ImportLists"));
select setval('public."IndexerStatus_Id_seq"',(SELECT MAX("Id")+1 FROM "IndexerStatus"));
select setval('public."Indexers_Id_seq"',(SELECT MAX("Id")+1 FROM "Indexers"));
select setval('public."MetadataFiles_Id_seq"',(SELECT MAX("Id")+1 FROM "MetadataFiles"));
select setval('public."Metadata_Id_seq"',(SELECT MAX("Id")+1 FROM "Metadata"));
select setval('public."NamingConfig_Id_seq"',(SELECT MAX("Id")+1 FROM "NamingConfig"));
select setval('public."NotificationStatus_Id_seq"',(SELECT MAX("Id")+1 FROM "NotificationStatus"));
select setval('public."Notifications_Id_seq"',(SELECT MAX("Id")+1 FROM "Notifications"));
select setval('public."PendingReleases_Id_seq"',(SELECT MAX("Id")+1 FROM "PendingReleases"));
select setval('public."QualityDefinitions_Id_seq"',(SELECT MAX("Id")+1 FROM "QualityDefinitions"));
select setval('public."QualityProfiles_Id_seq"',(SELECT MAX("Id")+1 FROM "QualityProfiles"));
select setval('public."RemotePathMappings_Id_seq"',(SELECT MAX("Id")+1 FROM "RemotePathMappings"));
select setval('public."RootFolders_Id_seq"',(SELECT MAX("Id")+1 FROM "RootFolders"));
select setval('public."SceneMappings_Id_seq"',(SELECT MAX("Id")+1 FROM "SceneMappings"));
select setval('public."ScheduledTasks_Id_seq"',(SELECT MAX("Id")+1 FROM "ScheduledTasks"));
select setval('public."Series_Id_seq"',(SELECT MAX("Id")+1 FROM "Series"));
select setval('public."SubtitleFiles_Id_seq"',(SELECT MAX("Id")+1 FROM "SubtitleFiles"));
select setval('public."Tags_Id_seq"',(SELECT MAX("Id")+1 FROM "Tags"));
select setval('public."Users_Id_seq"',(SELECT MAX("Id")+1 FROM "Users"));