diff --git a/rslib/src/backend/mod.rs b/rslib/src/backend/mod.rs
index 314b84383..470fc579d 100644
--- a/rslib/src/backend/mod.rs
+++ b/rslib/src/backend/mod.rs
@@ -599,7 +599,9 @@ impl Backend {
                     SortMode::FromConfig
                 };
                 let cids = search_cards(ctx, &input.search, order)?;
-                Ok(pb::SearchCardsOut { card_ids: cids })
+                Ok(pb::SearchCardsOut {
+                    card_ids: cids.into_iter().map(|v| v.0).collect(),
+                })
             })
         })
     }
diff --git a/rslib/src/card.rs b/rslib/src/card.rs
index 1ee1386b0..c79d0958c 100644
--- a/rslib/src/card.rs
+++ b/rslib/src/card.rs
@@ -1,9 +1,11 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
+use crate::define_newtype;
 use num_enum::TryFromPrimitive;
 use serde_repr::{Deserialize_repr, Serialize_repr};
 
+define_newtype!(CardID, i64);
 #[derive(Serialize_repr, Deserialize_repr, Debug, PartialEq, TryFromPrimitive, Clone, Copy)]
 #[repr(u8)]
 pub enum CardType {
diff --git a/rslib/src/config.rs b/rslib/src/config.rs
index c768b1122..46c952828 100644
--- a/rslib/src/config.rs
+++ b/rslib/src/config.rs
@@ -1,7 +1,7 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-use crate::types::ObjID;
+use crate::decks::DeckID;
 use serde::Deserialize as DeTrait;
 use serde_aux::field_attributes::deserialize_number_from_string;
 use serde_derive::Deserialize;
@@ -22,7 +22,7 @@ pub struct Config {
         rename = "curDeck",
         deserialize_with = "deserialize_number_from_string"
     )]
-    pub(crate) current_deck_id: ObjID,
+    pub(crate) current_deck_id: DeckID,
     pub(crate) rollover: Option<i8>,
     pub(crate) creation_offset: Option<i32>,
     pub(crate) local_offset: Option<i32>,
diff --git a/rslib/src/decks.rs b/rslib/src/decks.rs
index 16b80b261..2511d5af1 100644
--- a/rslib/src/decks.rs
+++ b/rslib/src/decks.rs
@@ -1,18 +1,21 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-use crate::types::ObjID;
+use crate::define_newtype;
 use serde_aux::field_attributes::deserialize_number_from_string;
 use serde_derive::Deserialize;
 
+define_newtype!(DeckID, i64);
+define_newtype!(DeckConfID, i64);
+
 #[derive(Deserialize)]
 pub struct Deck {
     #[serde(deserialize_with = "deserialize_number_from_string")]
-    pub(crate) id: ObjID,
+    pub(crate) id: DeckID,
     pub(crate) name: String,
 }
 
-pub(crate) fn child_ids<'a>(decks: &'a [Deck], name: &str) -> impl Iterator<Item = ObjID> + 'a {
+pub(crate) fn child_ids<'a>(decks: &'a [Deck], name: &str) -> impl Iterator<Item = DeckID> + 'a {
     let prefix = format!("{}::", name.to_ascii_lowercase());
     decks
         .iter()
@@ -20,7 +23,7 @@ pub(crate) fn child_ids<'a>(decks: &'a [Deck], name: &str) -> impl Iterator<Item
         .map(|d| d.id)
 }
 
-pub(crate) fn get_deck(decks: &[Deck], id: ObjID) -> Option<&Deck> {
+pub(crate) fn get_deck(decks: &[Deck], id: DeckID) -> Option<&Deck> {
     for d in decks {
         if d.id == id {
             return Some(d);
diff --git a/rslib/src/search/cards.rs b/rslib/src/search/cards.rs
index 8ab045b7b..db9c8effa 100644
--- a/rslib/src/search/cards.rs
+++ b/rslib/src/search/cards.rs
@@ -2,12 +2,12 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use super::{parser::Node, sqlwriter::node_to_sql};
+use crate::card::CardID;
 use crate::card::CardType;
 use crate::collection::RequestContext;
 use crate::config::SortKind;
 use crate::err::Result;
 use crate::search::parser::parse;
-use crate::types::ObjID;
 use rusqlite::params;
 
 pub(crate) enum SortMode {
@@ -21,7 +21,7 @@ pub(crate) fn search_cards<'a, 'b>(
     req: &'a mut RequestContext<'b>,
     search: &'a str,
     order: SortMode,
-) -> Result<Vec<ObjID>> {
+) -> Result<Vec<CardID>> {
     let top_node = Node::Group(parse(search)?);
     let (sql, args) = node_to_sql(req, &top_node)?;
 
@@ -50,7 +50,7 @@ pub(crate) fn search_cards<'a, 'b>(
     }
 
     let mut stmt = req.storage.db.prepare(&sql)?;
-    let ids: Vec<i64> = stmt
+    let ids: Vec<_> = stmt
         .query_map(&args, |row| row.get(0))?
         .collect::<std::result::Result<_, _>>()?;
 
diff --git a/rslib/src/storage/sqlite.rs b/rslib/src/storage/sqlite.rs
index 036e42b5d..32a9d0524 100644
--- a/rslib/src/storage/sqlite.rs
+++ b/rslib/src/storage/sqlite.rs
@@ -3,6 +3,7 @@
 
 use crate::collection::CollectionOp;
 use crate::config::Config;
+use crate::decks::DeckID;
 use crate::err::Result;
 use crate::err::{AnkiError, DBErrorKind};
 use crate::notetypes::NoteTypeID;
@@ -12,7 +13,7 @@ use crate::{
     notetypes::NoteType,
     sched::cutoff::{sched_timing_today, SchedTimingToday},
     text::without_combining,
-    types::{ObjID, Usn},
+    types::Usn,
 };
 use regex::Regex;
 use rusqlite::{functions::FunctionFlags, params, Connection, NO_PARAMS};
@@ -302,7 +303,7 @@ impl StorageContext<'_> {
         }
     }
 
-    pub(crate) fn all_decks(&self) -> Result<HashMap<ObjID, Deck>> {
+    pub(crate) fn all_decks(&self) -> Result<HashMap<DeckID, Deck>> {
         self.db
             .query_row_and_then("select decks from col", NO_PARAMS, |row| -> Result<_> {
                 Ok(serde_json::from_str(row.get_raw(0).as_str()?)?)
diff --git a/rslib/src/types.rs b/rslib/src/types.rs
index de4425e35..6d672d61e 100644
--- a/rslib/src/types.rs
+++ b/rslib/src/types.rs
@@ -1,8 +1,6 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-pub type ObjID = i64;
-
 #[macro_export]
 macro_rules! define_newtype {
     ( $name:ident, $type:ident ) => {