feat(#89): Add backup functionality for google drive and dropbox

supabase/migrations/20260123003000_add_pokedex_export_integrations.sql

@@ -0,0 +1,42 @@
+-- Enable exports to external providers (Google Drive / Dropbox)
+CREATE TABLE pokedex_export_integrations (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  "userId" UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+  "pokedexId" UUID REFERENCES pokedexes(id) ON DELETE CASCADE,
+  provider TEXT NOT NULL CHECK (provider IN ('google_drive', 'dropbox')),
+  enabled BOOLEAN NOT NULL DEFAULT TRUE,
+  "fileName" TEXT,
+  "folderId" TEXT,
+  path TEXT,
+  "accessToken" TEXT NOT NULL,
+  "refreshToken" TEXT,
+  "accessTokenExpiresAt" TIMESTAMPTZ,
+  metadata JSONB,
+  "lastExportedAt" TIMESTAMPTZ,
+  "lastError" TEXT,
+  "createdAt" TIMESTAMPTZ DEFAULT NOW(),
+  "updatedAt" TIMESTAMPTZ DEFAULT NOW(),
+  UNIQUE ("userId", provider)
+);
+
+CREATE INDEX idx_pokedex_export_integrations_user_id ON pokedex_export_integrations("userId");
+CREATE INDEX idx_pokedex_export_integrations_pokedex_id ON pokedex_export_integrations("pokedexId");
+CREATE INDEX idx_pokedex_export_integrations_provider ON pokedex_export_integrations(provider);
+
+CREATE TRIGGER update_pokedex_export_integrations_updated_at
+  BEFORE UPDATE ON pokedex_export_integrations
+  FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+ALTER TABLE pokedex_export_integrations ENABLE ROW LEVEL SECURITY;
+
+CREATE POLICY "Users can view own export integrations" ON pokedex_export_integrations
+  FOR SELECT USING ("userId" = auth.uid());
+
+CREATE POLICY "Users can create own export integrations" ON pokedex_export_integrations
+  FOR INSERT WITH CHECK ("userId" = auth.uid());
+
+CREATE POLICY "Users can update own export integrations" ON pokedex_export_integrations
+  FOR UPDATE USING ("userId" = auth.uid()) WITH CHECK ("userId" = auth.uid());
+
+CREATE POLICY "Users can delete own export integrations" ON pokedex_export_integrations
+  FOR DELETE USING ("userId" = auth.uid());