feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

migrations/0010_nip_rs_exact_replay_guard.sql

@@ -0,0 +1,55 @@
+-- Replace the published 0009 watermark guard without changing its checksum.
+-- Exact replay is a durable coordinate-level no-op, independent of whether the
+-- physically retained payload still exists.
+CREATE OR REPLACE FUNCTION guard_nip_rs_watermark() RETURNS trigger AS $$
+DECLARE
+    advanced BOOLEAN;
+BEGIN
+    IF NEW.kind = 30078
+       AND NEW.d_tag ~ '^read-state:[0-9a-f]{32}$'
+       AND EXISTS (
+           SELECT 1
+           FROM jsonb_array_elements(NEW.tags) tag
+           WHERE jsonb_typeof(tag) = 'array'
+             AND jsonb_array_length(tag) = 2
+             AND tag->>0 = 't'
+             AND tag->>1 = 'read-state'
+       ) THEN
+        INSERT INTO parameterized_event_watermarks
+            (community_id, kind, pubkey, d_tag, created_at, event_id)
+        VALUES
+            (NEW.community_id, NEW.kind, NEW.pubkey, NEW.d_tag, NEW.created_at, NEW.id)
+        ON CONFLICT (community_id, kind, pubkey, d_tag) DO UPDATE SET
+            created_at = EXCLUDED.created_at,
+            event_id = EXCLUDED.event_id
+        WHERE EXCLUDED.created_at > parameterized_event_watermarks.created_at
+           OR (EXCLUDED.created_at = parameterized_event_watermarks.created_at
+               AND EXCLUDED.event_id < parameterized_event_watermarks.event_id)
+        RETURNING TRUE INTO advanced;
+
+        IF NOT COALESCE(advanced, FALSE) THEN
+            -- Exact equality is idempotent at the durable coordinate level,
+            -- whether or not its payload is still live. Skip it in the trigger
+            -- so concurrent physical deletion cannot create a resurrection
+            -- window between an existence check and uniqueness enforcement.
+            IF EXISTS (
+                SELECT 1
+                FROM parameterized_event_watermarks
+                WHERE community_id = NEW.community_id
+                  AND kind = NEW.kind
+                  AND pubkey = NEW.pubkey
+                  AND d_tag = NEW.d_tag
+                  AND created_at = NEW.created_at
+                  AND event_id = NEW.id
+            ) THEN
+                RETURN NULL;
+            END IF;
+
+            RAISE EXCEPTION 'stale NIP-RS event rejected by durable watermark'
+                USING ERRCODE = 'check_violation';
+        END IF;
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;