migrations for repo_rev tracking and backlinks table

migrations/20260107_add_repo_rev_to_user_blocks.sql

@@ -0,0 +1,8 @@
+ALTER TABLE user_blocks ADD COLUMN IF NOT EXISTS repo_rev TEXT;
+
+UPDATE user_blocks ub
+SET repo_rev = r.repo_rev
+FROM repos r
+WHERE ub.user_id = r.user_id AND ub.repo_rev IS NULL;
+
+CREATE INDEX IF NOT EXISTS idx_user_blocks_repo_rev ON user_blocks(user_id, repo_rev);

migrations/20260114_backlinks.sql

@@ -0,0 +1,10 @@
+CREATE TABLE backlinks (
+    uri TEXT NOT NULL,
+    path TEXT NOT NULL,
+    link_to TEXT NOT NULL,
+    repo_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    PRIMARY KEY (uri, path)
+);
+
+CREATE INDEX backlinks_path_link_to_idx ON backlinks(path, link_to);
+CREATE INDEX backlinks_repo_id_idx ON backlinks(repo_id);