chore: update migrations scripts

fhevm-engine/fhevm-db/migrations/20250131125649_add_large_ct_column.sql

@@ -1,4 +1,3 @@
 ALTER TABLE ciphertexts 
 ADD COLUMN IF NOT EXISTS large_ct BYTEA,
-ADD COLUMN IF NOT EXISTS is_sent BOOLEAN NOT NULL DEFAULT FALSE,
-ADD COLUMN IF NOT EXISTS is_allowed BOOLEAN NOT NULL DEFAULT FALSE;
+ADD COLUMN IF NOT EXISTS is_sent BOOLEAN NOT NULL DEFAULT FALSE;

fhevm-engine/fhevm-db/migrations/20250205130209_create_pbs_computations_table.sql

@@ -0,0 +1,12 @@
+CREATE TABLE IF NOT EXISTS pbs_computations (
+    tenant_id INT NOT NULL,
+    handle BYTEA NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+    completed_at TIMESTAMP,
+    is_completed BOOLEAN NOT NULL DEFAULT FALSE, 
+    PRIMARY KEY (tenant_id, handle)
+);
+
+
+CREATE INDEX IF NOT EXISTS pbs_computations_handle_hash_idx ON pbs_computations USING HASH (handle);
+CREATE INDEX IF NOT EXISTS ciphertexts_handle_hash_idx ON ciphertexts USING HASH (handle);