feat: social graph features

migrations/0022_add_user_sampradaya.up.sql

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+-- Devotee's sampradāya (spiritual lineage). Every account defaults to the
+-- Gaudiya sampradāya; the column is NOT NULL so the value is always
+-- present. Stored as a lowercase code; the frontend maps it to a display
+-- label. Existing rows are backfilled to 'gaudiya' by the DEFAULT.
+ALTER TABLE users
+    ADD COLUMN IF NOT EXISTS sampradaya VARCHAR(32) NOT NULL DEFAULT 'gaudiya';