init push

backend/store/pg/migration/000018_create_settings.up.sql

@@ -0,0 +1,13 @@
+-- Create settings table
+CREATE TABLE IF NOT EXISTS settings (
+    id SERIAL PRIMARY KEY,
+    kb_id TEXT NOT NULL,
+    key TEXT NOT NULL,
+    value JSONB NOT NULL,
+    description TEXT,
+    created_at timestamptz NOT NULL DEFAULT NOW(),
+    updated_at timestamptz NOT NULL DEFAULT NOW()
+);
+
+-- Create unique index for kb_id + key combination
+CREATE UNIQUE INDEX idx_settings_kb_id_key ON settings (kb_id, key);