Initial commit: AS4/411 directory and discovery service for Sankofa Marketplace

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/storage/migrations/003_edges.sql

@@ -0,0 +1,20 @@
+-- Graph layer: edges with provenance and validity (see data-model.md).
+-- Optional: used when explicit graph and conflict resolution are needed.
+
+CREATE TABLE IF NOT EXISTS edges (
+  id TEXT PRIMARY KEY,
+  from_type TEXT NOT NULL,
+  from_id TEXT NOT NULL,
+  to_type TEXT NOT NULL,
+  to_id TEXT NOT NULL,
+  relation TEXT NOT NULL,
+  confidence REAL,
+  source TEXT,
+  valid_from TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  valid_to TIMESTAMPTZ
+);
+
+CREATE INDEX idx_edges_from ON edges(from_type, from_id);
+CREATE INDEX idx_edges_to ON edges(to_type, to_id);
+CREATE INDEX idx_edges_relation ON edges(relation);
+CREATE INDEX idx_edges_valid ON edges(valid_from, valid_to);