Phase 1: standalone events, external_url on nodes

- Migration: node_id nullable on events and occurrences, add
  title/description/is_primary to events, external_url to nodes
- Existing events marked is_primary: true (were all 1:1 with nodes)
- Node: has_one :event -> has_many :events
- Event: belongs_to :node optional, validates title presence for
  standalone events, is_primary uniqueness scoped to node_id,
  display_title helper falling back through node title
- Occurrence: belongs_to :node optional, summary falls back to
  event.display_title
- nodes_helper: event_information uses events.first (interim; will
  be replaced in Phase 3 event UI)
- Tests: fix node.event -> node.events.first in event_test

1 files changed, 9 insertions, 0 deletions

diff --git a/db/seeds/conflicts.txt b/db/seeds/conflicts.txt
new file mode 100644
index 00000000..a07471f6
--- /dev/null
+++ b/db/seeds/conflicts.txt
@@ -0,0 +1,9 @@
+Entries flagged for review: true — these have notable German/English discrepancies:
+
+erfa-berlin: DE says Tuesday+Thursday 19:00; EN says Thursday 17:00 only — the English version is likely outdated
+erfa-erlangen: DE says ZAM, Hauptstr. 65-67, Fridays 18:00; EN says E-Werk, Fuchsenwiese 1, Tuesdays 19:30 — different location and day entirely
+erfa-freiburg: DE says Adlerstraße 12a; EN says ArTik, Kaiser-Joseph-Strasse 141 — different address
+erfa-goettingen: DE says Von-Bar-Straße 2-4; EN says Neustadt 7 — different address
+erfa-hannover: DE says every Wednesday; EN says every second Wednesday and last Sunday — different schedule
+erfa-karlsruhe: DE says Saturday; EN says Sunday — different day
+erfa-ulm: DE says Café Einstein; EN says Freiraum, Platzgasse 18 — different venue