feat: feature flags

crates/presentation/Cargo.toml

@@ -3,6 +3,15 @@ name = "presentation"
 version = "0.1.0"
 edition = "2024"
 
+[features]
+default = ["sqlite", "sqlite-federation"]
+sqlite = ["dep:sqlite"]
+postgres = ["dep:postgres"]
+# Meta-feature: true when any federation adapter is active — keeps all #[cfg(feature = "federation")] gates working
+federation = []
+sqlite-federation = ["sqlite", "dep:sqlite-federation", "dep:activitypub", "federation"]
+postgres-federation = ["postgres", "dep:postgres-federation", "dep:activitypub", "federation"]
+
 [dependencies]
 tower-http = { version = "0.6.8", features = ["fs", "trace", "tracing"] }
 infer = "0.19.0"
@@ -28,19 +37,23 @@ auth = { workspace = true }
 metadata = { workspace = true }
 poster-fetcher = { workspace = true }
 poster-storage = { workspace = true }
-sqlite = { workspace = true }
-sqlite-federation = { workspace = true }
-postgres = { workspace = true }
-postgres-federation = { workspace = true }
-activitypub = { workspace = true }
-sqlx = { workspace = true }
 template-askama = { workspace = true }
 event-publisher = { workspace = true }
 rss = { workspace = true }
 export = { workspace = true }
 doc = { workspace = true }
+sqlx = { workspace = true }
 utoipa = { version = "5.5.0", features = ["axum_extras", "uuid"] }
 
+# Optional — database backends
+sqlite              = { workspace = true, optional = true }
+postgres            = { workspace = true, optional = true }
+
+# Optional — federation
+activitypub         = { workspace = true, optional = true }
+sqlite-federation   = { workspace = true, optional = true }
+postgres-federation = { workspace = true, optional = true }
+
 [dev-dependencies]
 tower = { version = "0.5", features = ["util"] }
 http-body-util = "0.1"