From 6200b061f23b3656da0cb3a406b9ab5f19d5bc2c Mon Sep 17 00:00:00 2001
From: patrickzerhusen <patrick.zerhusen@endex-geodaten.de>
Date: Fri, 24 Apr 2026 17:47:00 +0200
Subject: [PATCH] added migration for anonymous user identification by browser
 ID

---
 migrations/005_browser_id.sql | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 migrations/005_browser_id.sql

diff --git a/migrations/005_browser_id.sql b/migrations/005_browser_id.sql
new file mode 100644
index 0000000..7338902
--- /dev/null
+++ b/migrations/005_browser_id.sql
@@ -0,0 +1,27 @@
+-- =====================================================================
+-- Migration 005: Adds Browser ID for anonymous User Identification
+-- =====================================================================
+
+-- Adds browser_id Column to Contributions
+ALTER TABLE contributions
+    ADD COLUMN browser_id VARCHAR(36) DEFAULT NULL;
+
+-- Adds browser_id Column to Votes
+-- Replaces voter_name for Identification
+ALTER TABLE votes
+    ADD COLUMN browser_id VARCHAR(36) DEFAULT NULL;
+
+-- Index for fast Vote Lookup by Browser
+CREATE INDEX idx_votes_browser ON votes(browser_id);
+
+
+-- New UNIQUE Constraint: One Vote per Browser per Contribution
+
+-- Drops old Constraint voter_name based
+ALTER TABLE votes
+    DROP CONSTRAINT IF EXISTS votes_contribution_id_voter_name_key;
+
+-- Creates new Constraint browser_id based
+ALTER TABLE votes
+    ADD CONSTRAINT votes_contribution_browser_unique
+    UNIQUE (contribution_id, browser_id);
\ No newline at end of file