Add private event invitations

db/init/01_initial.sql

@@ -109,10 +109,23 @@ CREATE TABLE concerts (
     ticket_price NUMERIC(10,2),
     flyer_path TEXT,
     flyer_url TEXT,
+    visibility VARCHAR(20) NOT NULL DEFAULT 'public'
+        CHECK (visibility IN ('public', 'friends', 'private')),
     created_by INTEGER REFERENCES users(id) ON DELETE SET NULL,
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
 
+CREATE TABLE event_invitations (
+    concert_id INTEGER NOT NULL REFERENCES concerts(id) ON DELETE CASCADE,
+    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    invited_by INTEGER REFERENCES users(id) ON DELETE SET NULL,
+    viewed_at TIMESTAMP,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (concert_id, user_id)
+);
+
+CREATE INDEX idx_event_invitations_user ON event_invitations (user_id, viewed_at);
+
 CREATE TABLE concert_comments (
     id SERIAL PRIMARY KEY,
     concert_id INTEGER NOT NULL REFERENCES concerts(id) ON DELETE CASCADE,