Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

db/migrations/20260315001514_oauth.sql

@@ -0,0 +1,22 @@
+-- +goose Up
+
+ALTER TABLE users
+    ALTER COLUMN password_hash DROP NOT NULL;
+
+CREATE TABLE oauth_providers (
+    provider    TEXT NOT NULL,
+    provider_id TEXT NOT NULL,
+    user_id     TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    email       TEXT NOT NULL,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (provider, provider_id)
+);
+
+CREATE INDEX idx_oauth_providers_user ON oauth_providers(user_id);
+
+-- +goose Down
+
+DROP TABLE oauth_providers;
+
+UPDATE users SET password_hash = '' WHERE password_hash IS NULL;
+ALTER TABLE users ALTER COLUMN password_hash SET NOT NULL;