diff --git a/Cargo.lock b/Cargo.lock
index e3c42eb..b690794 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -150,6 +150,7 @@ dependencies = [
  "busbar-contract",
  "busbar-plugin-loader",
  "busbar-store-sqlite",
+ "busbar-store-sqlite-plugin",
  "reqwest",
  "rusqlite",
  "serde_json",
diff --git a/store-sqlite-plugin/Cargo.toml b/store-sqlite-plugin/Cargo.toml
index 8894521..76d63c2 100644
--- a/store-sqlite-plugin/Cargo.toml
+++ b/store-sqlite-plugin/Cargo.toml
@@ -13,12 +13,23 @@ license = "Apache-2.0"
 # rlib: REQUIRED for `cargo test` to emit the cdylib artifact the conformance and e2e tests load.
 crate-type = ["cdylib", "rlib"]
 
+[features]
+# THE DROPPED-IN DOOR: `export_door!` emits the one C symbol `busbar_plugin_door`, and ONLY the
+# dropped-in cdylib may export it (compiled in = dropped in, one table: a busbar build that links
+# this crate as a row, alone or beside others, must carry no door symbol, or two doors in one
+# binary multiply define it under `lto = "fat"`). OFF by default; the dropped-in artifact is built
+# `cargo build --release -p busbar-store-sqlite-plugin --features dropped-in`, and `cargo test` names this crate
+# below with it on so the cdylib the conformance test opens carries the door.
+dropped-in = []
+
 [dependencies]
 # THE LOGIC, same repo: its `door::door` is the door this image exports.
 busbar-store-sqlite = { path = "../store-sqlite" }
 busbar-contract = { git = "https://github.com/GetBusbar/busbar", rev = "e1d3d8b097201859751d77208e66249d98b50a4b" }
 
 [dev-dependencies]
+# The conformance test opens this crate's own cdylib WITH its dropped-in door on (see `[features]`).
+busbar-store-sqlite-plugin = { path = ".", features = ["dropped-in"] }
 # The conformance and e2e tests load the built cdylib and the linked door over the REAL loader (the
 # one dispatcher, the store v3 table) — dev-only, never in the shipped artifact. Same pinned rev as
 # the logic crate's busbar-contract, so one busbar source resolves.
diff --git a/store-sqlite-plugin/src/lib.rs b/store-sqlite-plugin/src/lib.rs
index 631bbc3..c022620 100644
--- a/store-sqlite-plugin/src/lib.rs
+++ b/store-sqlite-plugin/src/lib.rs
@@ -8,7 +8,7 @@
 //! All the store lives in the `busbar-store-sqlite` crate, including its one door
 //! (`busbar_store_sqlite::door::door`, the store v3 table). This crate re-exports the logic crate,
 //! so the library it builds carries exactly the code a busbar build links, and exports that door as
-//! the image's ONE symbol, `busbar_plugin_door` (`export_door!`, unconditionally) — one source,
+//! the image's ONE symbol, `busbar_plugin_door` (`export_door!`, behind the `dropped-in` feature) — one source,
 //! both doors (DECISIONS #2 rule (1)).
 //!
 //! This crate is `deny`, not `forbid`: the export macro's `#[unsafe(no_mangle)]` is the one reviewed
@@ -18,7 +18,9 @@
 
 pub use busbar_store_sqlite::*;
 
-/// The exported door: the macro's `#[no_mangle]` symbol is the one exemption.
+/// The exported door, behind `dropped-in` (the cdylib build only): the macro's `#[no_mangle]` symbol is
+/// the one exemption.
+#[cfg(feature = "dropped-in")]
 #[allow(unsafe_code)]
 mod exported {
     busbar_contract::export_door!(busbar_store_sqlite::door::door);