diff --git a/crates/mcp/src/main.rs b/crates/mcp/src/main.rs
index 523edba..0e38f47 100644
--- a/crates/mcp/src/main.rs
+++ b/crates/mcp/src/main.rs
@@ -127,6 +127,7 @@ fn wire_repositories(pool: &DbPool) -> anyhow::Result<WireOutput> {
                 library_query: w.library_query,
             })
         }
+        _ => anyhow::bail!("database backend not compiled into this binary"),
     }
 }
 
diff --git a/crates/presentation/src/factory.rs b/crates/presentation/src/factory.rs
index c5320f6..6a378a6 100644
--- a/crates/presentation/src/factory.rs
+++ b/crates/presentation/src/factory.rs
@@ -229,6 +229,7 @@ fn wire_repositories(pool: &DbPool) -> anyhow::Result<WireOutput> {
                 provider_config_query: w.provider_config_query,
             })
         }
+        _ => anyhow::bail!("database backend not compiled into this binary"),
     }
 }
 
diff --git a/k-tv-backend/README.md b/k-tv-backend/README.md
index a4f5cfc..8350f91 100644
--- a/k-tv-backend/README.md
+++ b/k-tv-backend/README.md
@@ -1,4 +1,6 @@
-# K-TV Backend
+# K-TV Backend (DEPRECATED)
+
+> **DEPRECATED**: This monolithic backend has been superseded by the new multi-crate workspace under `crates/`. Use `cargo build -p presentation` for the HTTP server and `cargo build -p mcp` for the MCP server. This directory is excluded from the workspace and will be removed in a future release.
 
 The Rust API server for K-TV — a self-hosted linear TV channel orchestration layer for personal media servers.