diff --git a/tools/observer/observer.mjs b/tools/observer/observer.mjs
index fd445ef5e..5141e8800 100644
--- a/tools/observer/observer.mjs
+++ b/tools/observer/observer.mjs
@@ -109,6 +109,9 @@ async function setupSchema() {
     `ALTER TABLE ${TB} ADD COLUMN IF NOT EXISTS proof_records int`,
     `ALTER TABLE ${TB} ADD COLUMN IF NOT EXISTS subsidy_sompi bigint`,
     `ALTER TABLE ${TB} ADD COLUMN IF NOT EXISTS paid_sompi bigint`,
+    // wei-scale amounts on the Igneum 2.0 chain (8 Oct 2026): widen both in place, a no-op once numeric
+    `ALTER TABLE ${TB} ALTER COLUMN subsidy_sompi TYPE numeric(40,0)`,
+    `ALTER TABLE ${TB} ALTER COLUMN paid_sompi TYPE numeric(40,0)`,
     `ALTER TABLE ${TB} ADD COLUMN IF NOT EXISTS selected_parent text`,
     `ALTER TABLE ${TB} ADD COLUMN IF NOT EXISTS number bigint`,
     `ALTER TABLE ${TB} ADD COLUMN IF NOT EXISTS detail jsonb`,
@@ -503,7 +506,8 @@ async function flushBlocks() {
   const rows = pendingBlocks.splice(0, 200);
   const cols = ['hash', 'blue_score', 'daa_score', 'timestamp_ms', 'parents', 'parent_hashes', 'is_chain_block', 'vote_key_hash', 'miner_address', 'engine',
     'tx_count', 'evm_miner', 'proof_records', 'subsidy_sompi', 'paid_sompi', 'selected_parent', 'detail'];
-  const cast = { parent_hashes: '::text[]', detail: '::jsonb', subsidy_sompi: '::bigint', paid_sompi: '::bigint' };
+  // numeric, not bigint: the Igneum 2.0 chain reports the subsidy and the paid amount in wei (9.52 IGN = 9522644482386090276, past int64; 8 Oct 2026)
+  const cast = { parent_hashes: '::text[]', detail: '::jsonb', subsidy_sompi: '::numeric', paid_sompi: '::numeric' };
   const params = []; const values = [];
   for (const r of rows) {
     const ph = [];