merger now requires a schema id, queryer and merger now use pre-compiled edges for O(1) relations

src/database/edge.rs

@@ -0,0 +1,7 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct Edge {
+  pub constraint: String,
+  pub forward: bool,
+}