feat: add comment config columns to campaign_subs (thread_title_pattern, thread_url_override, occurrence)

app/db/migrations/016_campaign_subs_comment_config.sql

@@ -0,0 +1,15 @@
+-- app/db/migrations/016_campaign_subs_comment_config.sql
+
+-- thread_title_pattern: case-insensitive substring to match the sticky thread title.
+-- Required for reddit_comment campaigns; NULL for reddit_post campaigns.
+ALTER TABLE campaign_subs ADD COLUMN thread_title_pattern TEXT;
+
+-- thread_url_override: skip thread detection and comment directly on this URL.
+-- Takes precedence over thread_title_pattern when set.
+ALTER TABLE campaign_subs ADD COLUMN thread_url_override TEXT;
+
+-- occurrence: scheduling modifier applied inside the job runner before execution.
+-- "every"        — fire on every scheduled run (default)
+-- "first_sunday" — fire only on the first Sunday of the month
+-- NULL           — treated as "every"
+ALTER TABLE campaign_subs ADD COLUMN occurrence TEXT;