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RFC/draft: opt-in libSQL/Turso storage backend for concurrent multi-writer memory #262

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RFC/draft: opt-in libSQL/Turso storage backend for concurrent multi-writer memory #262

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4d2853f
icm-store: minimal-diff libSQL/Turso overlay (alias dbcompat as rusql…
Donach Jun 4, 2026
13cd564
icm-store: make libSQL/Turso an opt-in backend (default stays rusqlite)
Donach Jun 4, 2026
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1,174 changes: 1,070 additions & 104 deletions Cargo.lock
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4 changes: 4 additions & 0 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,10 @@ strip = true
rusqlite = { version = "0.34", features = ["bundled", "modern_sqlite"] }
sqlite-vec = "0.1"
zerocopy = { version = "0.8", features = ["derive"] }
# libSQL / Turso backend (fork): remote (sqld) + embedded replica + sync.
libsql = { version = "0.9", default-features = false, features = ["core", "replication", "remote", "sync", "tls"] }
libsql-ffi = "0.9"
once_cell = "1"

# Embeddings (optional)
fastembed = "4"
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10 changes: 7 additions & 3 deletions crates/icm-cli/Cargo.toml
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Expand Up @@ -13,9 +13,13 @@ name = "icm"
path = "src/main.rs"

[features]
default = ["embeddings", "tui"]
default = ["embeddings", "tui", "backend-rusqlite"]
embeddings = ["icm-core/embeddings", "icm-mcp/embeddings"]
tui = ["dep:ratatui", "dep:crossterm"]
backend-rusqlite = ["icm-store/backend-rusqlite", "icm-mcp/backend-rusqlite"]
# Opt-in libSQL/Turso backend: build with
# `--no-default-features --features turso,embeddings,tui`.
turso = ["icm-store/turso", "icm-mcp/turso"]
web = ["dep:axum", "dep:tokio", "dep:tower-http", "dep:rust-embed", "dep:mime_guess", "dep:getrandom"]
# `openssl` is not used directly in our source code, but it gets pulled
# transitively via reqwest / hyper-tls / etc. (depending on the active
Expand All @@ -30,8 +34,8 @@ vendored-openssl = ["openssl/vendored"]

[dependencies]
icm-core = { path = "../icm-core" }
icm-store = { path = "../icm-store" }
icm-mcp = { path = "../icm-mcp" }
icm-store = { path = "../icm-store", default-features = false }
icm-mcp = { path = "../icm-mcp", default-features = false }
anyhow = { workspace = true }
clap = { workspace = true }
chrono = { workspace = true }
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6 changes: 4 additions & 2 deletions crates/icm-mcp/Cargo.toml
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Expand Up @@ -4,12 +4,14 @@ version = "0.10.34"
edition = "2021"

[features]
default = []
default = ["backend-rusqlite"]
backend-rusqlite = ["icm-store/backend-rusqlite"]
turso = ["icm-store/turso"]
embeddings = ["icm-core/embeddings"]

[dependencies]
icm-core = { path = "../icm-core" }
icm-store = { path = "../icm-store" }
icm-store = { path = "../icm-store", default-features = false }
chrono = { workspace = true }
serde = { workspace = true }
serde_json = { workspace = true }
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17 changes: 16 additions & 1 deletion crates/icm-store/Cargo.toml
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Expand Up @@ -5,7 +5,7 @@ edition = "2021"

[dependencies]
icm-core = { path = "../icm-core" }
rusqlite = { workspace = true }
rusqlite = { workspace = true, optional = true }
sqlite-vec = { workspace = true }
zerocopy = { workspace = true }
serde_json = { workspace = true }
Expand All @@ -15,5 +15,20 @@ lru = { workspace = true }
sha2 = { workspace = true }
ulid = { workspace = true }

# Optional libSQL/Turso backend. With `--features turso` the store runs over the
# async libsql client (local file, remote sqld/Turso server, or embedded
# replica); without it, behaviour is exactly upstream rusqlite.
libsql = { workspace = true, optional = true }
libsql-ffi = { workspace = true, optional = true }
once_cell = { workspace = true, optional = true }
tokio = { workspace = true, optional = true }

[features]
# Exactly one backend. Default is rusqlite (unchanged upstream); for libSQL/Turso
# build with `--no-default-features --features turso`.
default = ["backend-rusqlite"]
backend-rusqlite = ["dep:rusqlite"]
turso = ["dep:libsql", "dep:libsql-ffi", "dep:once_cell", "dep:tokio"]

[dev-dependencies]
tempfile = "3"
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