Let yaak-models compile for wasm32-unknown-unknown (#556)

crates/common/yaak-database/Cargo.toml

@@ -9,12 +9,20 @@ chrono = { version = "0.4.38", features = ["serde"] }
 include_dir = "0.7"
 log = { workspace = true }
 nanoid = "0.4.0"
-r2d2 = "0.8.10"
-r2d2_sqlite = { version = "0.25.0" }
-rusqlite = { version = "0.32.1", features = ["bundled", "chrono"] }
-sea-query = { version = "0.32.1", features = ["with-chrono", "attr"] }
-sea-query-rusqlite = { version = "0.7.0", features = ["with-chrono"] }
+rusqlite = { version = "0.38", features = ["bundled", "chrono"] }
+sea-query-rusqlite = { version = "0.8.0", features = ["with-chrono"] }
+sea-query = { version = "1.0", features = ["with-chrono", "attr"] }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 thiserror = { workspace = true }
 ts-rs = { workspace = true }
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+r2d2 = "0.8.10"
+r2d2_sqlite = { version = "0.32" }
+
+# nanoid pulls getrandom, which needs to be told how to reach the browser's
+# CSPRNG on wasm32-unknown-unknown. Native targets are unaffected.
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+getrandom = { version = "0.2", features = ["js"] }
+uuid = { version = "1", features = ["js"] }

crates/common/yaak-database/src/connection_or_tx.rs

@@ -1,9 +1,8 @@
-use r2d2::PooledConnection;
-use r2d2_sqlite::SqliteConnectionManager;
+use crate::pool::SqliteConn;
 use rusqlite::{Connection, Statement, ToSql, Transaction};
 
 pub enum ConnectionOrTx<'a> {
-    Connection(PooledConnection<SqliteConnectionManager>),
+    Connection(SqliteConn),
     Transaction(&'a Transaction<'a>),
 }
 

crates/common/yaak-database/src/db_context.rs

@@ -3,6 +3,7 @@ use crate::error::Error::ModelNotFound;
 use crate::error::Result;
 use crate::traits::UpsertModelInfo;
 use crate::update_source::UpdateSource;
+use sea_query::ExprTrait;
 use sea_query::{
     Asterisk, Expr, Func, IntoColumnRef, IntoIden, OnConflict, Query, SimpleExpr,
     SqliteQueryBuilder,

crates/common/yaak-database/src/error.rs

@@ -7,7 +7,7 @@ pub enum Error {
     SqlError(#[from] rusqlite::Error),
 
     #[error("SQL Pool error: {0}")]
-    SqlPoolError(#[from] r2d2::Error),
+    SqlPoolError(#[from] crate::pool::PoolError),
 
     #[error("Database error: {0}")]
     Database(String),

crates/common/yaak-database/src/lib.rs

@@ -2,6 +2,7 @@ pub mod connection_or_tx;
 pub mod db_context;
 pub mod error;
 pub mod migrate;
+pub mod pool;
 pub mod traits;
 pub mod update_source;
 pub mod util;
@@ -11,13 +12,15 @@ pub use connection_or_tx::ConnectionOrTx;
 pub use db_context::DbContext;
 pub use error::{Error, Result};
 pub use migrate::run_migrations;
+pub use pool::{PoolError, SqliteConn, SqlitePool};
 pub use traits::{UpsertModelInfo, upsert_date};
 pub use update_source::{ModelChangeEvent, UpdateSource};
 pub use util::{generate_id, generate_id_of_length, generate_prefixed_id};
 
-// Re-export pool types that consumers will need
+// Re-export types that consumers will need
+#[cfg(not(target_arch = "wasm32"))]
 pub use r2d2;
+#[cfg(not(target_arch = "wasm32"))]
 pub use r2d2_sqlite;
 pub use rusqlite;
 pub use sea_query;
-pub use sea_query_rusqlite;

crates/common/yaak-database/src/migrate.rs

@@ -1,8 +1,7 @@
 use crate::error::Result;
+use crate::pool::SqlitePool;
 use include_dir::Dir;
 use log::{debug, info};
-use r2d2::Pool;
-use r2d2_sqlite::SqliteConnectionManager;
 use rusqlite::{OptionalExtension, params};
 
 const TRACKING_TABLE: &str = "_sqlx_migrations";
@@ -11,7 +10,7 @@ const TRACKING_TABLE: &str = "_sqlx_migrations";
 ///
 /// Migrations are sorted by filename (use timestamp prefixes like `00000001_init.sql`).
 /// Applied migrations are tracked in `_sqlx_migrations`.
-pub fn run_migrations(pool: &Pool<SqliteConnectionManager>, dir: &Dir<'_>) -> Result<()> {
+pub fn run_migrations(pool: &SqlitePool, dir: &Dir<'_>) -> Result<()> {
     info!("Running migrations");
 
     // Create tracking table

crates/common/yaak-database/src/pool.rs

@@ -0,0 +1,80 @@
+//! Where connections come from.
+//!
+//! Every query in the model layer asks a pool for a connection, uses it, and
+//! hands it back. That is the whole contract, and it is the one place the
+//! desktop and the browser genuinely differ: the desktop has threads and wants
+//! an r2d2 pool; a browser tab has one thread, no way to spawn another, and one
+//! connection is exactly enough. Everything above this module is identical on
+//! both.
+//!
+//! On native targets `SqlitePool` *is* `r2d2::Pool` — a type alias, so nothing
+//! that already builds pools changes. On wasm it is one connection that every
+//! `get()` hands out a shared handle to.
+//!
+//! A `SqliteConn` only ever derefs immutably. The code above this layer opens
+//! transactions with [`rusqlite::Transaction::new_unchecked`], which takes
+//! `&Connection`; the `&mut` that `Connection::transaction` demands is a
+//! compile-time guard against nesting a transaction on one connection, and it
+//! is what would have forced the wasm pool to lend its connection exclusively.
+//! The model layer nests connections freely — a helper that already holds one
+//! calls another that asks for its own — so an exclusive lend would panic on
+//! the second ask. Sharing the handle instead makes nested *reads* work the way
+//! they do on the desktop; nested *write transactions* fail on both, only
+//! differently (here SQLite refuses the inner `BEGIN`; natively the inner
+//! connection blocks on `busy_timeout` and then fails).
+
+#[cfg(not(target_arch = "wasm32"))]
+mod imp {
+    use r2d2_sqlite::SqliteConnectionManager;
+
+    pub type SqlitePool = r2d2::Pool<SqliteConnectionManager>;
+    pub type SqliteConn = r2d2::PooledConnection<SqliteConnectionManager>;
+    pub type PoolError = r2d2::Error;
+}
+
+#[cfg(target_arch = "wasm32")]
+mod imp {
+    use rusqlite::Connection;
+    use std::ops::Deref;
+    use std::rc::Rc;
+
+    /// One connection, shared by everyone who asks.
+    ///
+    /// `Rc` rather than `Arc` because a `Connection` is `!Sync`, so wrapping
+    /// it in an `Arc` would buy no `Send`/`Sync` anyway — and there is one
+    /// thread here to be honest about.
+    #[derive(Clone, Debug)]
+    pub struct SqlitePool {
+        conn: Rc<Connection>,
+    }
+
+    impl SqlitePool {
+        pub fn single(conn: Connection) -> Self {
+            Self { conn: Rc::new(conn) }
+        }
+
+        /// Another handle to the connection. Cannot fail; the `Result` keeps
+        /// the signature identical to r2d2's so callers are written once.
+        pub fn get(&self) -> Result<SqliteConn, PoolError> {
+            Ok(SqliteConn(self.conn.clone()))
+        }
+    }
+
+    /// The error a `get()` would return if it could. It can't, so this has no
+    /// variants; it exists so `Error::SqlPoolError` has the same shape on both
+    /// targets.
+    #[derive(Debug, thiserror::Error)]
+    pub enum PoolError {}
+
+    #[derive(Debug)]
+    pub struct SqliteConn(Rc<Connection>);
+
+    impl Deref for SqliteConn {
+        type Target = Connection;
+        fn deref(&self) -> &Connection {
+            &self.0
+        }
+    }
+}
+
+pub use imp::*;

crates/yaak-models/Cargo.toml

@@ -11,11 +11,9 @@ hex = { workspace = true }
 include_dir = "0.7"
 log = { workspace = true }
 nanoid = "0.4.0"
-r2d2 = "0.8.10"
-r2d2_sqlite = { version = "0.25.0" }
-rusqlite = { version = "0.32.1", features = ["bundled", "chrono"] }
-sea-query = { version = "0.32.1", features = ["with-chrono", "attr"] }
-sea-query-rusqlite = { version = "0.7.0", features = ["with-chrono"] }
+rusqlite = { version = "0.38", features = ["bundled", "chrono"] }
+sea-query = { version = "1.0", features = ["with-chrono", "attr"] }
+sea-query-rusqlite = { version = "0.8.0", features = ["with-chrono"] }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 schemars = { workspace = true }
@@ -23,3 +21,7 @@ sha2 = { workspace = true }
 thiserror = { workspace = true }
 ts-rs = { workspace = true, features = ["chrono-impl", "serde-json-impl"] }
 yaak-core = { workspace = true }
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+r2d2 = "0.8.10"
+r2d2_sqlite = { version = "0.32" }

crates/yaak-models/src/blob_manager.rs

@@ -2,9 +2,8 @@ use crate::error::Result;
 use crate::util::generate_prefixed_id;
 use include_dir::{Dir, include_dir};
 use log::{debug, info};
-use r2d2::Pool;
-use r2d2_sqlite::SqliteConnectionManager;
 use rusqlite::{OptionalExtension, params};
+use yaak_database::{SqliteConn, SqlitePool};
 
 static BLOB_MIGRATIONS_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/blob_migrations");
 
@@ -29,11 +28,11 @@ impl BodyChunk {
 // whole app whenever the pool is exhausted.
 #[derive(Debug, Clone)]
 pub struct BlobManager {
-    pool: Pool<SqliteConnectionManager>,
+    pool: SqlitePool,
 }
 
 impl BlobManager {
-    pub fn new(pool: Pool<SqliteConnectionManager>) -> Self {
+    pub fn new(pool: SqlitePool) -> Self {
         Self { pool }
     }
 
@@ -45,7 +44,7 @@ impl BlobManager {
 
 /// Context for blob database operations.
 pub struct BlobContext {
-    conn: r2d2::PooledConnection<SqliteConnectionManager>,
+    conn: SqliteConn,
 }
 
 impl BlobContext {
@@ -131,7 +130,7 @@ impl BlobContext {
 }
 
 /// Run migrations for the blob database.
-pub fn migrate_blob_db(pool: &Pool<SqliteConnectionManager>) -> Result<()> {
+pub fn migrate_blob_db(pool: &SqlitePool) -> Result<()> {
     info!("Running blob database migrations");
 
     // Create migrations tracking table
@@ -198,9 +197,9 @@ pub fn migrate_blob_db(pool: &Pool<SqliteConnectionManager>) -> Result<()> {
 mod tests {
     use super::*;
 
-    fn create_test_pool() -> Pool<SqliteConnectionManager> {
-        let manager = SqliteConnectionManager::memory();
-        let pool = Pool::builder().max_size(1).build(manager).unwrap();
+    fn create_test_pool() -> SqlitePool {
+        let manager = r2d2_sqlite::SqliteConnectionManager::memory();
+        let pool = r2d2::Pool::builder().max_size(1).build(manager).unwrap();
         migrate_blob_db(&pool).unwrap();
         pool
     }

crates/yaak-models/src/error.rs

@@ -7,7 +7,7 @@ pub enum Error {
     SqlError(#[from] rusqlite::Error),
 
     #[error("SQL Pool error: {0}")]
-    SqlPoolError(#[from] r2d2::Error),
+    SqlPoolError(#[from] yaak_database::PoolError),
 
     #[error("Database error: {0}")]
     Database(String),

crates/yaak-models/src/lib.rs

@@ -1,15 +1,12 @@
 use crate::blob_manager::{BlobManager, migrate_blob_db};
-use crate::error::{Error, Result};
+use crate::error::Result;
 use crate::migrate::migrate_db;
 use crate::query_manager::QueryManager;
 use crate::util::ModelPayload;
 use log::info;
-use r2d2::Pool;
-use r2d2_sqlite::SqliteConnectionManager;
-use std::fs::create_dir_all;
-use std::path::{Path, PathBuf};
+use std::path::Path;
 use std::sync::mpsc;
-use std::time::Duration;
+use yaak_database::SqlitePool;
 
 pub mod blob_manager;
 pub mod client_db;
@@ -22,17 +19,78 @@ pub mod query_manager;
 pub mod render;
 pub mod util;
 
-fn sqlite_file_manager(path: impl Into<PathBuf>) -> SqliteConnectionManager {
-    SqliteConnectionManager::file(path.into()).with_init(|conn| {
-        conn.pragma_update(None, "journal_mode", "WAL")?;
-        conn.pragma_update(None, "synchronous", "NORMAL")?;
-        conn.busy_timeout(Duration::from_millis(5000))
-    })
+/// Per-connection setup, applied by every pool on every connection it opens.
+fn init_connection(conn: &rusqlite::Connection) -> rusqlite::Result<()> {
+    conn.busy_timeout(std::time::Duration::from_millis(5000))
 }
 
-fn sqlite_memory_manager() -> SqliteConnectionManager {
-    SqliteConnectionManager::memory()
-        .with_init(|conn| conn.busy_timeout(Duration::from_millis(5000)))
+fn init_file_connection(conn: &rusqlite::Connection) -> rusqlite::Result<()> {
+    conn.pragma_update(None, "journal_mode", "WAL")?;
+    conn.pragma_update(None, "synchronous", "NORMAL")?;
+    init_connection(conn)
+}
+
+/// The two ways a pool comes to exist, one per target.
+///
+/// On the desktop and CLI, an r2d2 pool over a file. In a browser, a single
+/// connection over whatever VFS the host registered before calling in — the
+/// path is a name inside that VFS, not a place on disk. Everything downstream
+/// of `SqlitePool` is target-agnostic; this is the only fork.
+#[cfg(not(target_arch = "wasm32"))]
+mod open {
+    use super::*;
+    use crate::error::Error;
+    use r2d2::Pool;
+    use r2d2_sqlite::SqliteConnectionManager;
+    use std::path::PathBuf;
+    use std::time::Duration;
+
+    pub fn file_pool(path: impl Into<PathBuf>, max_size: u32, min_idle: u32) -> Result<SqlitePool> {
+        let path: PathBuf = path.into();
+        // Create parent directories if needed
+        if let Some(parent) = path.parent() {
+            std::fs::create_dir_all(parent)?;
+        }
+        let manager = SqliteConnectionManager::file(path).with_init(|c| init_file_connection(c));
+        Pool::builder()
+            .max_size(max_size)
+            .min_idle(Some(min_idle))
+            .connection_timeout(Duration::from_secs(10))
+            .build(manager)
+            .map_err(|e| Error::Database(e.to_string()))
+    }
+
+    pub fn memory_pool() -> Result<SqlitePool> {
+        let manager = SqliteConnectionManager::memory().with_init(|c| init_connection(c));
+        // In-memory DB doesn't support multiple connections
+        Pool::builder().max_size(1).build(manager).map_err(|e| Error::Database(e.to_string()))
+    }
+}
+
+#[cfg(target_arch = "wasm32")]
+mod open {
+    use super::*;
+    use rusqlite::Connection;
+    use std::path::PathBuf;
+
+    pub fn file_pool(
+        path: impl Into<PathBuf>,
+        _max_size: u32,
+        _min_idle: u32,
+    ) -> Result<SqlitePool> {
+        // No WAL: the browser VFSs are single-connection and journal their own
+        // way; the pragma is accepted and ignored on some and rejected on
+        // others, so it is not applied at all here.
+        let conn = Connection::open(path.into())?;
+        init_connection(&conn)?;
+        Ok(SqlitePool::single(conn))
+    }
+
+    pub fn memory_pool() -> Result<SqlitePool> {
+        let conn = Connection::open_in_memory()?;
+        init_connection(&conn)?;
+        Ok(SqlitePool::single(conn))
+    }
 }
 
 /// Initialize the database managers for standalone (non-Tauri) usage.
@@ -46,40 +104,16 @@ pub fn init_standalone(
     let db_path = db_path.as_ref();
     let blob_path = blob_path.as_ref();
 
-    // Create parent directories if needed
-    if let Some(parent) = db_path.parent() {
-        create_dir_all(parent)?;
-    }
-    if let Some(parent) = blob_path.parent() {
-        create_dir_all(parent)?;
-    }
-
     // Main database pool. Sized for concurrent in-flight queries, not concurrent app
     // features — connections are held per-statement, so even heavy fan-out (e.g. many
     // gRPC streams) only needs a handful at once. Keep max_size modest: WAL connections
     // hold ~3 file descriptors each, and macOS GUI apps get a 256 fd soft limit.
     info!("Initializing app database {db_path:?}");
-    let manager = sqlite_file_manager(db_path);
-    let pool = Pool::builder()
-        .max_size(20)
-        .min_idle(Some(2))
-        .connection_timeout(Duration::from_secs(10))
-        .build(manager)
-        .map_err(|e| Error::Database(e.to_string()))?;
-
+    let pool = open::file_pool(db_path, 20, 2)?;
     migrate_db(&pool)?;
 
     info!("Initializing blobs database {blob_path:?}");
-
-    // Blob database pool
-    let blob_manager = sqlite_file_manager(blob_path);
-    let blob_pool = Pool::builder()
-        .max_size(10)
-        .min_idle(Some(1))
-        .connection_timeout(Duration::from_secs(10))
-        .build(blob_manager)
-        .map_err(|e| Error::Database(e.to_string()))?;
-
+    let blob_pool = open::file_pool(blob_path, 10, 1)?;
     migrate_blob_db(&blob_pool)?;
 
     let (tx, rx) = mpsc::channel();
@@ -92,22 +126,10 @@ pub fn init_standalone(
 /// Initialize the database managers with in-memory SQLite databases.
 /// Useful for testing and CI environments.
 pub fn init_in_memory() -> Result<(QueryManager, BlobManager, mpsc::Receiver<ModelPayload>)> {
-    // Main database pool
-    let manager = sqlite_memory_manager();
-    let pool = Pool::builder()
-        .max_size(1) // In-memory DB doesn't support multiple connections
-        .build(manager)
-        .map_err(|e| Error::Database(e.to_string()))?;
-
+    let pool = open::memory_pool()?;
     migrate_db(&pool)?;
 
-    // Blob database pool
-    let blob_manager = sqlite_memory_manager();
-    let blob_pool = Pool::builder()
-        .max_size(1)
-        .build(blob_manager)
-        .map_err(|e| Error::Database(e.to_string()))?;
-
+    let blob_pool = open::memory_pool()?;
     migrate_blob_db(&blob_pool)?;
 
     let (tx, rx) = mpsc::channel();

crates/yaak-models/src/migrate.rs

@@ -2,14 +2,13 @@ use crate::error::Error::MigrationError;
 use crate::error::Result;
 use include_dir::{Dir, DirEntry, include_dir};
 use log::{debug, info};
-use r2d2::Pool;
-use r2d2_sqlite::SqliteConnectionManager;
-use rusqlite::{OptionalExtension, TransactionBehavior, params};
+use rusqlite::{OptionalExtension, Transaction, TransactionBehavior, params};
 use sha2::{Digest, Sha384};
+use yaak_database::SqlitePool;
 
 static MIGRATIONS_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/migrations");
 
-pub fn migrate_db(pool: &Pool<SqliteConnectionManager>) -> Result<()> {
+pub fn migrate_db(pool: &SqlitePool) -> Result<()> {
     info!("Running database migrations");
 
     // Ensure the table exists
@@ -43,8 +42,10 @@ pub fn migrate_db(pool: &Pool<SqliteConnectionManager>) -> Result<()> {
     let mut ran_migrations = 0;
     for entry in entries {
         num_migrations += 1;
-        let mut conn = pool.get()?;
-        let mut tx = conn.transaction_with_behavior(TransactionBehavior::Immediate)?;
+        let conn = pool.get()?;
+        // `new_unchecked` takes `&Connection`; see yaak_database::pool for why
+        // the pool never hands out `&mut`.
+        let mut tx = Transaction::new_unchecked(&conn, TransactionBehavior::Immediate)?;
         match run_migration(entry, &mut tx) {
             Ok(ran) => {
                 if ran {
@@ -74,7 +75,7 @@ pub fn migrate_db(pool: &Pool<SqliteConnectionManager>) -> Result<()> {
 }
 
 fn run_migration(migration_path: &DirEntry, tx: &mut rusqlite::Transaction) -> Result<bool> {
-    let start = std::time::Instant::now();
+    let start = elapsed_timer();
     let (version, description) = split_migration_filename(migration_path.path().to_str().unwrap())
         .expect("Failed to parse migration filename");
 
@@ -97,7 +98,7 @@ fn run_migration(migration_path: &DirEntry, tx: &mut rusqlite::Transaction) -> R
     // Split on `;`? → optional depending on how your SQL is structured
     tx.execute_batch(&sql)?;
 
-    let execution_time = start.elapsed().as_nanos() as i64;
+    let execution_time = start();
     let checksum = sha384_hex_prefixed(sql.as_bytes());
 
     // NOTE: The success column is never used. It's just there for sqlx compatibility.
@@ -109,6 +110,21 @@ fn run_migration(migration_path: &DirEntry, tx: &mut rusqlite::Transaction) -> R
     Ok(true)
 }
 
+/// Nanoseconds since the timer was started, for the sqlx-compatible
+/// `execution_time` column. `Instant` does not exist on `wasm32-unknown-unknown`
+/// (there is no monotonic clock to ask), and the column is bookkeeping, so
+/// there it reads as zero rather than taking the migrator down with it.
+#[cfg(not(target_arch = "wasm32"))]
+fn elapsed_timer() -> impl Fn() -> i64 {
+    let start = std::time::Instant::now();
+    move || start.elapsed().as_nanos() as i64
+}
+
+#[cfg(target_arch = "wasm32")]
+fn elapsed_timer() -> impl Fn() -> i64 {
+    || 0
+}
+
 fn split_migration_filename(filename: &str) -> Option<(String, String)> {
     // Remove the .sql extension
     let trimmed = filename.strip_suffix(".sql")?;

crates/yaak-models/src/queries/graphql_introspections.rs

@@ -3,6 +3,7 @@ use crate::error::Result;
 use crate::models::{GraphQlIntrospection, GraphQlIntrospectionIden};
 use crate::util::UpdateSource;
 use chrono::{Duration, Utc};
+use sea_query::ExprTrait;
 use sea_query::{Expr, Query, SqliteQueryBuilder};
 use sea_query_rusqlite::RusqliteBinder;
 

crates/yaak-models/src/queries/grpc_connections.rs

@@ -4,6 +4,7 @@ use crate::models::{GrpcConnection, GrpcConnectionIden, GrpcConnectionState};
 use crate::queries::MAX_HISTORY_ITEMS;
 use crate::util::UpdateSource;
 use log::debug;
+use sea_query::ExprTrait;
 use sea_query::{Expr, Query, SqliteQueryBuilder};
 use sea_query_rusqlite::RusqliteBinder;
 

crates/yaak-models/src/queries/http_responses.rs

@@ -5,6 +5,7 @@ use crate::models::{HttpResponse, HttpResponseIden, HttpResponseState};
 use crate::queries::MAX_HISTORY_ITEMS;
 use crate::util::UpdateSource;
 use log::{debug, error};
+use sea_query::ExprTrait;
 use sea_query::{Expr, Query, SqliteQueryBuilder};
 use sea_query_rusqlite::RusqliteBinder;
 use std::fs;

crates/yaak-models/src/queries/key_values.rs

@@ -4,6 +4,7 @@ use crate::models::{KeyValue, KeyValueIden, UpsertModelInfo};
 use crate::util::UpdateSource;
 use chrono::NaiveDateTime;
 use log::error;
+use sea_query::ExprTrait;
 use sea_query::{Asterisk, Cond, Expr, Query, SqliteQueryBuilder};
 use sea_query_rusqlite::RusqliteBinder;
 

crates/yaak-models/src/queries/plugin_key_values.rs

@@ -1,6 +1,7 @@
 use crate::client_db::ClientDb;
 use crate::error::Result;
 use crate::models::{PluginKeyValue, PluginKeyValueIden};
+use sea_query::ExprTrait;
 use sea_query::Keyword::CurrentTimestamp;
 use sea_query::{Asterisk, Cond, Expr, OnConflict, Query, SqliteQueryBuilder};
 use sea_query_rusqlite::RusqliteBinder;

crates/yaak-models/src/queries/sync_states.rs

@@ -2,6 +2,7 @@ use crate::client_db::ClientDb;
 use crate::error::Result;
 use crate::models::{SyncState, SyncStateIden, UpsertModelInfo};
 use crate::util::UpdateSource;
+use sea_query::ExprTrait;
 use sea_query::{Asterisk, Cond, Expr, Query, SqliteQueryBuilder};
 use sea_query_rusqlite::RusqliteBinder;
 use std::path::Path;

crates/yaak-models/src/queries/websocket_connections.rs

@@ -4,6 +4,7 @@ use crate::models::{WebsocketConnection, WebsocketConnectionIden, WebsocketConne
 use crate::queries::MAX_HISTORY_ITEMS;
 use crate::util::UpdateSource;
 use log::debug;
+use sea_query::ExprTrait;
 use sea_query::{Expr, Query, SqliteQueryBuilder};
 use sea_query_rusqlite::RusqliteBinder;
 

crates/yaak-models/src/query_manager.rs

@@ -1,23 +1,21 @@
 use crate::client_db::ClientDb;
 use crate::error::Error::GenericError;
 use crate::util::ModelPayload;
-use r2d2::Pool;
-use r2d2_sqlite::SqliteConnectionManager;
-use rusqlite::TransactionBehavior;
+use rusqlite::{Transaction, TransactionBehavior};
 use std::sync::mpsc;
-use yaak_database::{ConnectionOrTx, DbContext};
+use yaak_database::{ConnectionOrTx, DbContext, SqlitePool};
 
 // Pool is internally synchronized — don't wrap it in a Mutex. A Mutex held across the
 // blocking `get()` serializes every DB access behind the slowest waiter, freezing the
 // whole app whenever the pool is exhausted.
 #[derive(Debug, Clone)]
 pub struct QueryManager {
-    pool: Pool<SqliteConnectionManager>,
+    pool: SqlitePool,
     events_tx: mpsc::Sender<ModelPayload>,
 }
 
 impl QueryManager {
-    pub fn new(pool: Pool<SqliteConnectionManager>, events_tx: mpsc::Sender<ModelPayload>) -> Self {
+    pub fn new(pool: SqlitePool, events_tx: mpsc::Sender<ModelPayload>) -> Self {
         QueryManager { pool, events_tx }
     }
 
@@ -46,9 +44,10 @@ impl QueryManager {
     where
         E: From<crate::error::Error>,
     {
-        let mut conn = self.pool.get().expect("Failed to get new DB connection from the pool");
-        let tx = conn
-            .transaction_with_behavior(TransactionBehavior::Immediate)
+        let conn = self.pool.get().expect("Failed to get new DB connection from the pool");
+        // `new_unchecked` takes `&Connection`; see yaak_database::pool for why
+        // the pool never hands out `&mut`.
+        let tx = Transaction::new_unchecked(&conn, TransactionBehavior::Immediate)
             .expect("Failed to start DB transaction");
 
         let ctx = DbContext::new(ConnectionOrTx::Transaction(&tx));