From ee78de792303486f4602487dd536bc7c13c1893f Mon Sep 17 00:00:00 2001
From: oiupoyt <oiupoyt.cat@gmail.com>
Date: Thu, 17 Sep 2026 07:51:54 +0530
Subject: [PATCH] initial commit: OpenRouter free model radar Discord bot (WIP)

---
 .gitignore     |    1 +
 Cargo.lock     | 2476 ++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml     |   19 +
 README.md      |   16 +
 src/catalog.rs |  318 +++++++
 src/main.rs    |   38 +
 src/store.rs   |  223 +++++
 7 files changed, 3091 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 src/catalog.rs
 create mode 100644 src/main.rs
 create mode 100644 src/store.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
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+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..7b57d4e
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+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f75b4683f6c7f45248d4d64056a24298c6281e0993356d7d1b4a1a962ef10d4a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 3.0.6",
+ "synstructure",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13c156562582aa81c60cb29407084cdb54c4164760106ab78e6c5b0858cf64e"
+
+[[package]]
+name = "zerotrie"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ea269c3bd32f0a32c321907a2ae912ba6f4649bb0fc764a15627e99a7095a3f"
+dependencies = [
+ "displaydoc",
+ "yoke",
+ "zerofrom",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.11.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb0464e17806c1d976d5cba29399c7f08e516e279e2ba493f63123b5fca67dd8"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.11.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34df6fc39dbd26ddc9c10e6a2984476e13acce22e64e4487636ef494369225da"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 3.0.6",
+]
+
+[[package]]
+name = "zlib-rs"
+version = "0.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b268e58e7c693d7c271f93ffc4ba3b380412554231c85bf61ca7af91042a4112"
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..3064da9
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "model-radar"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+poise = "0.7"
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "fs", "signal", "time", "sync"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+[profile.dev]
+debug = 0
+
+[profile.test]
+debug = 0
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8e76ed0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,16 @@
+# model-radar
+
+> **Status:** Work in Progress (WIP)
+
+A Discord bot that monitors [OpenRouter](https://openrouter.ai) for free LLM models and alerts/pings users when new free models become available.
+
+## Features (WIP)
+
+- Polls OpenRouter model catalog API for free tiers (`:free`)
+- Tracks pricing and availability diffs
+- Discord slash commands via poise & serenity
+- Automated role/user pings on model drops
+
+## License
+
+MIT
diff --git a/src/catalog.rs b/src/catalog.rs
new file mode 100644
index 0000000..319e5e5
--- /dev/null
+++ b/src/catalog.rs
@@ -0,0 +1,318 @@
+use std::collections::BTreeMap;
+
+use serde::{Deserialize, Serialize};
+
+use crate::Error;
+
+const ENDPOINT: &str = "https://openrouter.ai/api/v1/models";
+const MAX_RESPONSE_BYTES: usize = 8 * 1024 * 1024;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Model {
+    pub id: String,
+    pub name: String,
+    #[serde(default)]
+    pub description: String,
+    #[serde(default)]
+    pub context_length: u64,
+    #[serde(default)]
+    pub pricing: BTreeMap<String, String>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Event {
+    pub model: Model,
+    pub kind: String,
+}
+
+fn is_decimal_zero(raw: &str) -> bool {
+    let body = raw.strip_prefix(['+', '-']).unwrap_or(raw);
+    let mantissa = if let Some((mantissa, exponent)) = body.split_once(['e', 'E']) {
+        let exponent = exponent.strip_prefix(['+', '-']).unwrap_or(exponent);
+        if exponent.is_empty() || !exponent.bytes().all(|b| b.is_ascii_digit()) {
+            return false;
+        }
+        mantissa
+    } else {
+        body
+    };
+    let mut seen_dot = false;
+    let mut digits = 0usize;
+    mantissa.bytes().all(|b| match b {
+        b'.' if !seen_dot => {
+            seen_dot = true;
+            true
+        }
+        b'0' => {
+            digits += 1;
+            true
+        }
+        _ => false,
+    }) && digits > 0
+}
+
+impl Model {
+    pub fn is_free(&self) -> bool {
+        if !is_decimal_zero(
+            self.pricing
+                .get("prompt")
+                .map(String::as_str)
+                .unwrap_or_default(),
+        ) || !is_decimal_zero(
+            self.pricing
+                .get("completion")
+                .map(String::as_str)
+                .unwrap_or_default(),
+        ) {
+            return false;
+        }
+        self.pricing.values().all(|value| is_decimal_zero(value))
+    }
+}
+
+fn validate(catalog: &BTreeMap<String, Model>) -> Result<(), Error> {
+    if catalog.is_empty() {
+        return Err("catalog is empty".into());
+    }
+    for (key, model) in catalog {
+        if model.id.trim().is_empty() || model.name.trim().is_empty() {
+            return Err("model identity is empty".into());
+        }
+        if key != &model.id {
+            return Err(
+                format!("catalog key {key:?} does not match model id {:?}", model.id).into(),
+            );
+        }
+    }
+    Ok(())
+}
+
+fn parse_catalog(bytes: &[u8]) -> Result<BTreeMap<String, Model>, Error> {
+    #[derive(Deserialize)]
+    struct Response {
+        data: Vec<Model>,
+    }
+    let response: Response = serde_json::from_slice(bytes)?;
+    let mut catalog = BTreeMap::new();
+    for model in response.data {
+        if model.id.trim().is_empty() || model.name.trim().is_empty() {
+            return Err("model identity is empty".into());
+        }
+        if catalog.insert(model.id.clone(), model).is_some() {
+            return Err("duplicate model id".into());
+        }
+    }
+    validate(&catalog)?;
+    Ok(catalog)
+}
+
+pub async fn fetch(client: &reqwest::Client) -> Result<BTreeMap<String, Model>, Error> {
+    let mut response = client.get(ENDPOINT).send().await?.error_for_status()?;
+    let mut payload: Vec<u8> = Vec::new();
+    while let Some(chunk) = response.chunk().await? {
+        if chunk.len() > MAX_RESPONSE_BYTES - payload.len() {
+            return Err("response exceeds 8 MiB limit".into());
+        }
+        payload.extend_from_slice(&chunk);
+    }
+    parse_catalog(&payload)
+}
+
+pub fn changes(
+    previous: &BTreeMap<String, Model>,
+    current: &BTreeMap<String, Model>,
+) -> Vec<Event> {
+    let mut events = Vec::new();
+    for (id, model) in current {
+        match previous.get(id) {
+            None => events.push(Event {
+                model: model.clone(),
+                kind: "new".to_string(),
+            }),
+            Some(old) if !old.is_free() && model.is_free() => events.push(Event {
+                model: model.clone(),
+                kind: "paid_to_free".to_string(),
+            }),
+            _ => {}
+        }
+    }
+    events
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn model(id: &str, pricing: &[(&str, &str)]) -> Model {
+        Model {
+            id: id.to_string(),
+            name: id.to_string(),
+            description: String::new(),
+            context_length: 4096,
+            pricing: pricing
+                .iter()
+                .map(|(k, v)| (k.to_string(), v.to_string()))
+                .collect(),
+        }
+    }
+
+    fn map(models: Vec<Model>) -> BTreeMap<String, Model> {
+        models.into_iter().map(|m| (m.id.clone(), m)).collect()
+    }
+
+    #[test]
+    fn free_requires_exact_decimal_zero() {
+        assert!(model("a", &[("prompt", "0"), ("completion", "0")]).is_free());
+        assert!(model("a", &[("prompt", "0.0"), ("completion", "-0")]).is_free());
+        assert!(model("a", &[("prompt", "+0.00000"), ("completion", "0")]).is_free());
+        assert!(
+            !model(
+                "a",
+                &[("prompt", "0.00000000000000000001"), ("completion", "0")]
+            )
+            .is_free()
+        );
+        assert!(!model("a", &[("prompt", "1e-9"), ("completion", "0")]).is_free());
+        assert!(!model("a", &[("prompt", ""), ("completion", "0")]).is_free());
+        assert!(!model("a", &[("prompt", "abc"), ("completion", "0")]).is_free());
+        assert!(
+            !model(
+                "a",
+                &[("prompt", "0"), ("completion", "0"), ("request", "0.1")]
+            )
+            .is_free()
+        );
+        assert!(!model("a", &[]).is_free());
+    }
+
+    #[test]
+    fn decimal_zero_edge_cases() {
+        for value in ["0", "00", "-0", "+0.00", "0e-9999", "0E+9999", ".0", "0."] {
+            assert!(
+                model("a", &[("prompt", value), ("completion", value)]).is_free(),
+                "{value}"
+            );
+        }
+        for value in [
+            "1e-9999", "-1e-9999", "NaN", "inf", "-1", ".", "+", "-", "", "0e", "0e+", "0e1.0",
+            "0e0e0", "0..0", "--0", "0x0", " 0", "0 ", "０",
+        ] {
+            assert!(
+                !model("a", &[("prompt", value), ("completion", "0")]).is_free(),
+                "{value}"
+            );
+            assert!(
+                !model("a", &[("prompt", "0"), ("completion", value)]).is_free(),
+                "{value}"
+            );
+            assert!(
+                !model(
+                    "a",
+                    &[("prompt", "0"), ("completion", "0"), ("unknown", value)]
+                )
+                .is_free(),
+                "{value}"
+            );
+        }
+        let tiny = format!("0.{}1", "0".repeat(400));
+        assert!(!model("a", &[("prompt", &tiny), ("completion", "0")]).is_free());
+        assert!(!model("a", &[("prompt", "0")]).is_free());
+        assert!(!model("a", &[("completion", "0")]).is_free());
+        assert!(
+            model(
+                "a",
+                &[("prompt", "0"), ("completion", "0"), ("unknown", "0.0")]
+            )
+            .is_free()
+        );
+    }
+
+    #[test]
+    fn changes_detects_new_and_paid_to_free() {
+        let prev = map(vec![
+            model("a", &[("prompt", "1"), ("completion", "1")]),
+            model("b", &[("prompt", "0"), ("completion", "0")]),
+        ]);
+        let cur = map(vec![
+            model("a", &[("prompt", "0"), ("completion", "0")]),
+            model("b", &[("prompt", "0"), ("completion", "0")]),
+            model("c", &[("prompt", "0"), ("completion", "0")]),
+            model("d", &[("prompt", "2"), ("completion", "3")]),
+        ]);
+        let events = changes(&prev, &cur);
+        let kinds: Vec<&str> = events.iter().map(|e| e.kind.as_str()).collect();
+        assert_eq!(kinds, vec!["paid_to_free", "new", "new"]);
+        assert_eq!(events[0].model.id, "a");
+        assert_eq!(events[1].model.id, "c");
+        assert_eq!(events[2].model.id, "d");
+        assert!(!events[2].model.is_free());
+    }
+
+    #[test]
+    fn changes_ignores_removals_and_unchanged() {
+        let prev = map(vec![model("a", &[("prompt", "0"), ("completion", "0")])]);
+        let cur = BTreeMap::new();
+        assert!(changes(&prev, &cur).is_empty());
+        assert_eq!(changes(&cur, &prev).len(), 1);
+        assert!(changes(&prev, &prev).is_empty());
+        let paid = map(vec![model("a", &[("prompt", "1"), ("completion", "1")])]);
+        assert!(changes(&prev, &paid).is_empty());
+        assert!(changes(&paid, &paid).is_empty());
+    }
+
+    #[test]
+    fn parse_rejects_empty() {
+        assert!(parse_catalog(b"{\"data\":[]}").is_err());
+        assert!(parse_catalog(b"{}").is_err());
+    }
+
+    #[test]
+    fn parse_rejects_malformed() {
+        for body in [
+            "not json",
+            r#"{"data":null}"#,
+            r#"{"data":{}}"#,
+            r#"{"data":[{"id":"","name":"A"}]}"#,
+            r#"{"data":[{"id":"  ","name":"A"}]}"#,
+            r#"{"data":[{"id":"a","name":"  "}]}"#,
+            r#"{"data":[{"name":"A"}]}"#,
+            r#"{"data":[{"id":"a"}]}"#,
+            r#"{"data":[{"id":1,"name":"A"}]}"#,
+            r#"{"data":[{"id":"a","name":"A","context_length":-1}]}"#,
+            r#"{"data":[{"id":"a","name":"A","pricing":{"prompt":0}}]}"#,
+            r#"{"data":[{"id":"a","name":"A","description":null}]}"#,
+            r#"{"data":[{"id":"a","name":"A"}]} trailing"#,
+        ] {
+            assert!(parse_catalog(body.as_bytes()).is_err(), "{body}");
+        }
+    }
+
+    #[test]
+    fn parse_rejects_duplicates() {
+        let body = r#"{"data":[{"id":"a","name":"A"},{"id":"a","name":"B"}]}"#;
+        assert!(parse_catalog(body.as_bytes()).is_err());
+    }
+
+    #[test]
+    fn parse_accepts_valid() {
+        let body = r#"{"data":[{"id":"a","name":"A","context_length":8192,"pricing":{"prompt":"0","completion":"0"}}]}"#;
+        let catalog = parse_catalog(body.as_bytes()).unwrap();
+        assert_eq!(catalog.len(), 1);
+        assert!(catalog["a"].is_free());
+        assert_eq!(catalog["a"].context_length, 8192);
+    }
+
+    #[test]
+    fn parse_defaults_optional_metadata_and_prices() {
+        let catalog = parse_catalog(br#"{"data":[{"id":"a","name":"A"}]}"#).unwrap();
+        assert_eq!(catalog["a"].description, "");
+        assert_eq!(catalog["a"].context_length, 0);
+        assert!(catalog["a"].pricing.is_empty());
+        assert!(!catalog["a"].is_free());
+    }
+
+    #[test]
+    fn validate_rejects_empty_catalog() {
+        assert!(validate(&BTreeMap::new()).is_err());
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7ecc154
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,38 @@
+mod catalog;
+mod store;
+
+use poise::serenity_prelude as serenity;
+
+type Error = Box<dyn std::error::Error + Send + Sync>;
+type Context<'a> = poise::Context<'a, (), Error>;
+
+#[poise::command(slash_command)]
+async fn ping(ctx: Context<'_>) -> Result<(), Error> {
+    ctx.say("Model Radar is online.").await?;
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    let token = std::env::var("DISCORD_TOKEN")?;
+    let mut ping = ping();
+    ping.description = Some("Check whether Model Radar is online".into());
+    let framework = poise::Framework::builder()
+        .options(poise::FrameworkOptions {
+            commands: vec![ping],
+            ..Default::default()
+        })
+        .setup(|ctx, _, framework| {
+            Box::pin(async move {
+                poise::builtins::register_globally(ctx, &framework.options().commands).await?;
+                Ok(())
+            })
+        })
+        .build();
+    serenity::ClientBuilder::new(token, serenity::GatewayIntents::GUILDS)
+        .framework(framework)
+        .await?
+        .start()
+        .await?;
+    Ok(())
+}
diff --git a/src/store.rs b/src/store.rs
new file mode 100644
index 0000000..e077b60
--- /dev/null
+++ b/src/store.rs
@@ -0,0 +1,223 @@
+use std::collections::BTreeMap;
+use std::io::{ErrorKind, Write};
+use std::path::PathBuf;
+use std::sync::atomic::{AtomicU64, Ordering};
+
+use serde::{Deserialize, Serialize};
+
+use crate::Error;
+use crate::catalog::{Event, Model};
+
+static TEMP_SEQUENCE: AtomicU64 = AtomicU64::new(0);
+
+#[derive(Clone, Default, Debug, Serialize, Deserialize)]
+pub struct State {
+    pub initialized: bool,
+    pub catalog: BTreeMap<String, Model>,
+    pub subscriptions: BTreeMap<u64, Subscription>,
+    pub last_success: Option<u64>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Subscription {
+    pub channel_id: u64,
+    pub role_id: Option<u64>,
+    pub free_only: bool,
+    pub pending: Vec<Event>,
+}
+
+pub struct Store {
+    pub state: State,
+    path: PathBuf,
+}
+
+impl Store {
+    pub async fn load(path: PathBuf) -> Result<Self, Error> {
+        let state = match tokio::fs::read(&path).await {
+            Ok(bytes) => serde_json::from_slice(&bytes)?,
+            Err(error) if error.kind() == ErrorKind::NotFound => State::default(),
+            Err(error) => return Err(error.into()),
+        };
+        Ok(Self { state, path })
+    }
+
+    pub async fn commit(&mut self, next: State) -> Result<(), Error> {
+        let bytes = serde_json::to_vec(&next)?;
+        let path = self.path.clone();
+        tokio::task::spawn_blocking(move || -> Result<(), Error> {
+            let name = path.file_name().ok_or("state path has no file name")?;
+            let (temporary, mut file) = loop {
+                let sequence = TEMP_SEQUENCE.fetch_add(1, Ordering::Relaxed);
+                let mut temporary_name = name.to_os_string();
+                temporary_name.push(format!(".{}.{}.tmp", std::process::id(), sequence));
+                let temporary = path.with_file_name(temporary_name);
+                match std::fs::OpenOptions::new()
+                    .write(true)
+                    .create_new(true)
+                    .open(&temporary)
+                {
+                    Ok(file) => break (temporary, file),
+                    Err(error) if error.kind() == ErrorKind::AlreadyExists => continue,
+                    Err(error) => return Err(error.into()),
+                }
+            };
+            let result = (|| -> Result<(), Error> {
+                file.write_all(&bytes)?;
+                file.sync_all()?;
+                drop(file);
+                std::fs::rename(&temporary, &path)?;
+                Ok(())
+            })();
+            if result.is_err() {
+                let _ = std::fs::remove_file(&temporary);
+            }
+            result
+        })
+        .await??;
+        self.state = next;
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    struct TestDirectory(PathBuf);
+
+    impl TestDirectory {
+        fn new() -> Self {
+            loop {
+                let sequence = TEMP_SEQUENCE.fetch_add(1, Ordering::Relaxed);
+                let path = std::env::temp_dir().join(format!(
+                    "model-radar-store-test-{}-{}",
+                    std::process::id(),
+                    sequence
+                ));
+                match std::fs::create_dir(&path) {
+                    Ok(()) => return Self(path),
+                    Err(error) if error.kind() == ErrorKind::AlreadyExists => continue,
+                    Err(error) => panic!("{error}"),
+                }
+            }
+        }
+
+        fn state_path(&self) -> PathBuf {
+            self.0.join("state.json")
+        }
+    }
+
+    impl Drop for TestDirectory {
+        fn drop(&mut self) {
+            let _ = std::fs::remove_dir_all(&self.0);
+        }
+    }
+
+    fn populated_state() -> State {
+        let model = Model {
+            id: "example/model".into(),
+            name: "Example".into(),
+            description: "Description".into(),
+            context_length: 8192,
+            pricing: BTreeMap::from([
+                ("prompt".into(), "0".into()),
+                ("completion".into(), "0".into()),
+            ]),
+        };
+        State {
+            initialized: true,
+            catalog: BTreeMap::from([(model.id.clone(), model.clone())]),
+            subscriptions: BTreeMap::from([
+                (
+                    u64::MAX,
+                    Subscription {
+                        channel_id: 42,
+                        role_id: Some(99),
+                        free_only: true,
+                        pending: vec![Event {
+                            model,
+                            kind: "new".into(),
+                        }],
+                    },
+                ),
+                (
+                    1,
+                    Subscription {
+                        channel_id: 43,
+                        role_id: None,
+                        free_only: false,
+                        pending: Vec::new(),
+                    },
+                ),
+            ]),
+            last_success: Some(123456),
+        }
+    }
+
+    #[tokio::test]
+    async fn missing_file_defaults_without_writing() {
+        let directory = TestDirectory::new();
+        let path = directory.state_path();
+        let store = Store::load(path.clone()).await.unwrap();
+        assert!(!store.state.initialized);
+        assert!(store.state.catalog.is_empty());
+        assert!(store.state.subscriptions.is_empty());
+        assert_eq!(store.state.last_success, None);
+        assert!(!path.exists());
+    }
+
+    #[tokio::test]
+    async fn persistence_round_trip_and_replacement() {
+        let directory = TestDirectory::new();
+        let path = directory.state_path();
+        let mut store = Store::load(path.clone()).await.unwrap();
+        let next = populated_state();
+        store.commit(next.clone()).await.unwrap();
+        let loaded = Store::load(path.clone()).await.unwrap();
+        let expected = serde_json::to_value(&next).unwrap();
+        assert_eq!(serde_json::to_value(&store.state).unwrap(), expected);
+        assert_eq!(serde_json::to_value(&loaded.state).unwrap(), expected);
+        store.commit(State::default()).await.unwrap();
+        let loaded = Store::load(path).await.unwrap();
+        assert!(!loaded.state.initialized);
+        assert!(loaded.state.catalog.is_empty());
+        assert!(loaded.state.subscriptions.is_empty());
+        assert_eq!(loaded.state.last_success, None);
+        assert_eq!(std::fs::read_dir(&directory.0).unwrap().count(), 1);
+    }
+
+    #[tokio::test]
+    async fn corrupt_files_are_errors_and_not_overwritten() {
+        let directory = TestDirectory::new();
+        let path = directory.state_path();
+        for bytes in ["", "not json", "{}", "null", "{\"initialized\":false"] {
+            tokio::fs::write(&path, bytes).await.unwrap();
+            assert!(Store::load(path.clone()).await.is_err());
+            assert_eq!(tokio::fs::read(&path).await.unwrap(), bytes.as_bytes());
+        }
+    }
+
+    #[tokio::test]
+    async fn failed_rename_preserves_state_and_cleans_temporary() {
+        let directory = TestDirectory::new();
+        let path = directory.state_path();
+        let mut store = Store::load(path.clone()).await.unwrap();
+        tokio::fs::create_dir(&path).await.unwrap();
+        assert!(store.commit(populated_state()).await.is_err());
+        assert!(!store.state.initialized);
+        assert!(store.state.catalog.is_empty());
+        assert!(path.is_dir());
+        assert_eq!(std::fs::read_dir(&directory.0).unwrap().count(), 1);
+        assert!(Store::load(path).await.is_err());
+    }
+
+    #[tokio::test]
+    async fn missing_parent_commit_preserves_state() {
+        let directory = TestDirectory::new();
+        let path = directory.0.join("missing").join("state.json");
+        let mut store = Store::load(path).await.unwrap();
+        assert!(store.commit(populated_state()).await.is_err());
+        assert!(!store.state.initialized);
+        assert!(store.state.subscriptions.is_empty());
+    }
+}