initial commit, lots of random shit

src/lib/server/entity/Edge.ts

@@ -0,0 +1,29 @@
+import {BeforeInsert, Entity, ManyToOne, PrimaryColumn} from 'typeorm';
+
+import {Node} from '$lib/server/entity/Node';
+import {ulidMonotonic} from '$lib/server/ulid';
+
+@Entity()
+export class Edge {
+	@PrimaryColumn({type: 'varchar', length: 26})
+	id = ulidMonotonic();
+
+	@ManyToOne(() => Node, node => node.outgoingEdges, {
+		nullable: false,
+		cascade: true,
+		onDelete: 'CASCADE',
+	})
+	head!: Node;
+
+	@ManyToOne(() => Node, node => node.incomingEdges, {
+		nullable: false,
+		cascade: true,
+		onDelete: 'CASCADE',
+	})
+	tail!: Node;
+
+	@BeforeInsert()
+	beforeInsert () {
+		this.id = ulidMonotonic();
+	}
+}