diff --git a/Cargo.lock b/Cargo.lock
index b1f67b4..47e2b95 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -84,35 +84,24 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.101"
+version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f0e0fee31ef5ed1ba1316088939cea399010ed7731dba877ed44aeb407a75ea"
+checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
 
 [[package]]
-name = "autocfg"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
-
-[[package]]
-name = "bincode"
-version = "2.0.1"
+name = "atomic-polyfill"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36eaf5d7b090263e8150820482d5d93cd964a81e4019913c972f4edcc6edb740"
+checksum = "8cf2bce30dfe09ef0bfaef228b9d414faaf7e563035494d7fe092dba54b300f4"
 dependencies = [
- "bincode_derive",
- "serde",
- "unty",
+ "critical-section",
 ]
 
 [[package]]
-name = "bincode_derive"
-version = "2.0.1"
+name = "autocfg"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf95709a440f45e986983918d0e8a1f30a9b1df04918fc828670606804ac3c09"
-dependencies = [
- "virtue",
-]
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
 
 [[package]]
 name = "bitflags"
@@ -190,11 +179,22 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
 
+[[package]]
+name = "chacha20"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f8d983286843e49675a4b7a2d174efe136dc93a18d69130dd18198a6c167601"
+dependencies = [
+ "cfg-if",
+ "cpufeatures 0.3.0",
+ "rand_core 0.10.0",
+]
+
 [[package]]
 name = "chrono"
-version = "0.4.43"
+version = "0.4.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fac4744fb15ae8337dc853fee7fb3f4e48c0fbaa23d0afe49c447b4fab126118"
+checksum = "c673075a2e0e5f4a1dde27ce9dee1ea4558c7ffe648f576438a20ca1d2acc4b0"
 dependencies = [
  "iana-time-zone",
  "js-sys",
@@ -253,6 +253,15 @@ dependencies = [
  "error-code",
 ]
 
+[[package]]
+name = "cobs"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fa961b519f0b462e3a3b4a34b64d119eeaca1d59af726fe450bbba07a9fc0a1"
+dependencies = [
+ "thiserror",
+]
+
 [[package]]
 name = "colorchoice"
 version = "1.0.4"
@@ -292,6 +301,21 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "cpufeatures"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "critical-section"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
+
 [[package]]
 name = "crokey"
 version = "1.4.0"
@@ -535,6 +559,18 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
 
+[[package]]
+name = "embedded-io"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef1a6892d9eef45c8fa6b9e0086428a2cca8491aca8f787c534a3d6d0bcb3ced"
+
+[[package]]
+name = "embedded-io"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edd0f118536f44f5ccd48bcb8b111bdc3de888b58c74639dfb034a357d0f206d"
+
 [[package]]
 name = "endian-type"
 version = "0.1.2"
@@ -616,6 +652,12 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
 
+[[package]]
+name = "foldhash"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77ce24cb58228fbb8aa041425bb1050850ac19177686ea6e0f41a70416f56fdb"
+
 [[package]]
 name = "form_urlencoded"
 version = "1.2.2"
@@ -662,6 +704,7 @@ dependencies = [
  "cfg-if",
  "libc",
  "r-efi",
+ "rand_core 0.10.0",
  "wasip2",
  "wasip3",
 ]
@@ -681,13 +724,22 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "hash32"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0c35f58762feb77d74ebe43bdbc3210f09be9fe6742234d573bacc26ed92b67"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.15.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
 dependencies = [
- "foldhash",
+ "foldhash 0.1.5",
 ]
 
 [[package]]
@@ -695,14 +747,31 @@ name = "hashbrown"
 version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
+dependencies = [
+ "foldhash 0.2.0",
+]
 
 [[package]]
 name = "hashlink"
-version = "0.10.0"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7382cf6263419f2d8df38c55d7da83da5c18aef87fc7a7fc1fb1e344edfe14c1"
+checksum = "ea0b22561a9c04a7cb1a302c013e0259cd3b4bb619f145b32f72b8b4bcbed230"
 dependencies = [
- "hashbrown 0.15.5",
+ "hashbrown 0.16.1",
+]
+
+[[package]]
+name = "heapless"
+version = "0.7.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdc6457c0eb62c71aac4bc17216026d8410337c4126773b9c5daba343f17964f"
+dependencies = [
+ "atomic-polyfill",
+ "hash32",
+ "rustc_version",
+ "serde",
+ "spin",
+ "stable_deref_trait",
 ]
 
 [[package]]
@@ -974,9 +1043,9 @@ dependencies = [
 
 [[package]]
 name = "libsqlite3-sys"
-version = "0.35.0"
+version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "133c182a6a2c87864fe97778797e46c7e999672690dc9fa3ee8e241aa4a9c13f"
+checksum = "95b4103cffefa72eb8428cb6b47d6627161e51c2739fc5e3b734584157bc642a"
 dependencies = [
  "cc",
  "pkg-config",
@@ -1174,6 +1243,19 @@ version = "0.3.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7edddbd0b52d732b21ad9a5fab5c704c14cd949e5e9a1ec5929a24fded1b904c"
 
+[[package]]
+name = "postcard"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6764c3b5dd454e283a30e6dfe78e9b31096d9e32036b5d1eaac7a6119ccb9a24"
+dependencies = [
+ "cobs",
+ "embedded-io 0.4.0",
+ "embedded-io 0.6.1",
+ "heapless",
+ "serde",
+]
+
 [[package]]
 name = "potential_utf"
 version = "0.1.4"
@@ -1226,28 +1308,6 @@ version = "5.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
 
-[[package]]
-name = "r2d2"
-version = "0.8.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51de85fb3fb6524929c8a2eb85e6b6d363de4e8c48f9e2c2eac4944abc181c93"
-dependencies = [
- "log",
- "parking_lot",
- "scheduled-thread-pool",
-]
-
-[[package]]
-name = "r2d2_sqlite"
-version = "0.31.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "63417e83dc891797eea3ad379f52a5986da4bca0d6ef28baf4d14034dd111b0c"
-dependencies = [
- "r2d2",
- "rusqlite",
- "uuid",
-]
-
 [[package]]
 name = "radix_trie"
 version = "0.2.1"
@@ -1265,7 +1325,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6db2770f06117d490610c7488547d543617b21bfa07796d7a12f6f1bd53850d1"
 dependencies = [
  "rand_chacha",
- "rand_core",
+ "rand_core 0.9.5",
+]
+
+[[package]]
+name = "rand"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc266eb313df6c5c09c1c7b1fbe2510961e5bcd3add930c1e31f7ed9da0feff8"
+dependencies = [
+ "chacha20",
+ "getrandom 0.4.1",
+ "rand_core 0.10.0",
 ]
 
 [[package]]
@@ -1275,7 +1346,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.9.5",
 ]
 
 [[package]]
@@ -1287,6 +1358,12 @@ dependencies = [
  "getrandom 0.3.4",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c8d0fd677905edcbeedbf2edb6494d676f0e98d54d5cf9bda0b061cb8fb8aba"
+
 [[package]]
 name = "rayon"
 version = "1.11.0"
@@ -1345,11 +1422,21 @@ version = "0.8.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a96887878f22d7bad8a3b6dc5b7440e0ada9a245242924394987b21cf2210a4c"
 
+[[package]]
+name = "rsqlite-vfs"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8a1f2315036ef6b1fbacd1972e8ee7688030b0a2121edfc2a6550febd41574d"
+dependencies = [
+ "hashbrown 0.16.1",
+ "thiserror",
+]
+
 [[package]]
 name = "rusqlite"
-version = "0.37.0"
+version = "0.38.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "165ca6e57b20e1351573e3729b958bc62f0e48025386970b6e4d29e7a7e71f3f"
+checksum = "f1c93dd1c9683b438c392c492109cb702b8090b2bfc8fed6f6e4eb4523f17af3"
 dependencies = [
  "bitflags",
  "fallible-iterator",
@@ -1357,13 +1444,14 @@ dependencies = [
  "hashlink",
  "libsqlite3-sys",
  "smallvec",
+ "sqlite-wasm-rs",
 ]
 
 [[package]]
 name = "rusqlite_migration"
-version = "2.3.0"
+version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3fc9767ae49274bafd3e55be9d30405a033b7a59548327d87fd4971fbb58e264"
+checksum = "67ffe0efe8568c769d1e39c67ea2a093134afaac9bb4559246a2ee7a4d686044"
 dependencies = [
  "log",
  "rusqlite",
@@ -1439,15 +1527,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "scheduled-thread-pool"
-version = "0.2.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3cbc66816425a074528352f5789333ecff06ca41b36b0b0efdfbb29edc391a19"
-dependencies = [
- "parking_lot",
-]
-
 [[package]]
 name = "scopeguard"
 version = "1.2.0"
@@ -1523,7 +1602,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
 dependencies = [
  "cfg-if",
- "cpufeatures",
+ "cpufeatures 0.2.17",
  "digest",
 ]
 
@@ -1570,6 +1649,27 @@ version = "1.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
 
+[[package]]
+name = "spin"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+dependencies = [
+ "lock_api",
+]
+
+[[package]]
+name = "sqlite-wasm-rs"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f4206ed3a67690b9c29b77d728f6acc3ce78f16bf846d83c94f76400320181b"
+dependencies = [
+ "cc",
+ "js-sys",
+ "rsqlite-vfs",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "stable_deref_trait"
 version = "1.2.1"
@@ -1590,18 +1690,18 @@ checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
 name = "strum"
-version = "0.27.2"
+version = "0.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af23d6f6c1a224baef9d3f61e287d2761385a5b88fdab4eb4c6f11aeb54c4bcf"
+checksum = "9628de9b8791db39ceda2b119bbe13134770b56c138ec1d3af810d045c04f9bd"
 dependencies = [
  "strum_macros",
 ]
 
 [[package]]
 name = "strum_macros"
-version = "0.27.2"
+version = "0.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7695ce3845ea4b33927c055a39dc438a45b059f7c1b3d91d38d10355fb8cbca7"
+checksum = "ab85eea0270ee17587ed4156089e10b9e6880ee688791d45a905f5b1ca36f664"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -1733,19 +1833,17 @@ checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
 
 [[package]]
 name = "trane"
-version = "0.27.0"
+version = "0.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9518599d7cd88858b0226ab5a6501c7bf22e6309f5fa5bd99d4564c3be7d056a"
+checksum = "04d70ed1d2e4be11ddc05de4970fbb3ba2b8ef3101460b0f1352de40733bcac8"
 dependencies = [
  "anyhow",
- "bincode",
  "chrono",
  "derive_builder",
  "indoc",
  "parking_lot",
- "r2d2",
- "r2d2_sqlite",
- "rand",
+ "postcard",
+ "rand 0.10.0",
  "rayon",
  "rusqlite",
  "rusqlite_migration",
@@ -1759,7 +1857,7 @@ dependencies = [
 
 [[package]]
 name = "trane-cli"
-version = "0.27.0"
+version = "0.28.0"
 dependencies = [
  "anyhow",
  "built",
@@ -1769,7 +1867,7 @@ dependencies = [
  "git2",
  "hex",
  "indoc",
- "rand",
+ "rand 0.9.2",
  "rustyline",
  "rustyline-derive",
  "serde",
@@ -1818,12 +1916,6 @@ version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
 
-[[package]]
-name = "unty"
-version = "0.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d49784317cd0d1ee7ec5c716dd598ec5b4483ea832a2dced265471cc0f690ae"
-
 [[package]]
 name = "url"
 version = "2.5.8"
@@ -1861,18 +1953,6 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
-[[package]]
-name = "uuid"
-version = "1.21.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b672338555252d43fd2240c714dc444b8c6fb0a5c5335e65a07bba7742735ddb"
-dependencies = [
- "getrandom 0.4.1",
- "js-sys",
- "rand",
- "wasm-bindgen",
-]
-
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
@@ -1885,12 +1965,6 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
-[[package]]
-name = "virtue"
-version = "0.0.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "051eb1abcf10076295e815102942cc58f9d5e3b4560e46e53c21e8ff6f3af7b1"
-
 [[package]]
 name = "walkdir"
 version = "2.5.0"
diff --git a/Cargo.toml b/Cargo.toml
index 60efe9d..dc88341 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 edition = "2021"
 name = "trane-cli"
-version = "0.27.0"
+version = "0.28.0"
 build = "build.rs"
 default-run = "trane"
 
@@ -29,7 +29,7 @@ rustyline-derive = "0.11.1"
 tempfile = "3.21.0"
 serde_json = "1.0.143"
 termimad = "0.33.0"
-trane = "0.27.0"
+trane = "0.28.0"
 # Commented out for use in local development.
 # trane = { path = "../trane" }
 ustr = { version = "1.1.0", features = ["serde"] }
diff --git a/src/app.rs b/src/app.rs
index 3e82b22..c105f01 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -883,12 +883,7 @@ impl TraneApp {
     }
 
     /// Shows the most recent scores for the given exercise.
-    pub fn show_scores(
-        &self,
-        exercise_id: Ustr,
-        num_scores: usize,
-        num_rewards: usize,
-    ) -> Result<()> {
+    pub fn show_scores(&self, exercise_id: Ustr, num_scores: u32, num_rewards: u32) -> Result<()> {
         ensure!(self.trane.is_some(), "no Trane instance is open");
 
         // Retrieve and validate information about the exercise.
@@ -1024,7 +1019,7 @@ impl TraneApp {
 
     /// Trims the scores for each exercise by removing all the scores except for the `num_scores`
     /// most recent scores.
-    pub fn trim_scores(&mut self, num_scores: usize) -> Result<()> {
+    pub fn trim_scores(&mut self, num_scores: u32) -> Result<()> {
         ensure!(self.trane.is_some(), "no Trane instance is open");
         self.trane.as_mut().unwrap().trim_scores(num_scores)?;
         println!("Trimmed scores for all exercises");
diff --git a/src/cli.rs b/src/cli.rs
index b6b802a..0e94918 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -88,7 +88,7 @@ pub(crate) enum DebugSubcommands {
     TrimScores {
         #[clap(help = "The number of trials to keep for each exercise")]
         #[clap(default_value = "20")]
-        num_trials: usize,
+        num_trials: u32,
     },
 
     #[clap(about = "Prints information about the given unit")]
@@ -468,11 +468,11 @@ pub(crate) enum Subcommands {
 
         #[clap(help = "The number of scores to show")]
         #[clap(long, short, default_value = "20")]
-        num_scores: usize,
+        num_scores: u32,
 
         #[clap(help = "The number of rewards to show")]
         #[clap(long, short, default_value = "5")]
-        num_rewards: usize,
+        num_rewards: u32,
     },
 
     #[clap(about = "Subcommands for manipulating the exercise scheduler")]