- Change chmod permissions from 0600 (owner-only) to 0666 (read/write for all) for database file and WAL files in blockchain node database initialization
- Update comment to reflect permissive permissions for handling filesystem restrictions
- Update agent daemon service database path from /var/lib/aitbc/data/ait-mainnet/chain.db to /var/lib/aitbc/data/chain.db
- Update PRAGMA journal_mode from WAL to DELETE in set_sqlite_pragma
- Addresses filesystem permission issues with WAL mode in containerized environments
- Add try-except blocks around os.chmod calls in init_db to ignore OSError exceptions
- Add comments noting permission errors are ignored for read-only filesystems in containers
- Wrap chmod for database file, WAL-shm, and WAL-wal files with error handling
- Remove StartLimitBurst and StartLimitIntervalSec from agent-coordinator systemd service
- Remove ProtectSystem, ProtectHome, and ReadWritePaths security
- Add hash conflict detection in import_block to delete existing blocks with same hash
- Add hash conflict cleanup in import_chain before importing blocks
- Add logging for hash conflict deletions showing affected chains
- Add WAL file permission setting in init_db for .db-shm and .db-wal files
- Add test_import_chain_clears_hash_conflicts_across_chains to verify cross-chain hash cleanup
- Wrap _compute_state_root in try/except to handle failures during genesis block creation
- Return None and log warning when state root computation fails (e.g., when accounts don't exist yet)
- Add error handling in init_db to ignore "already exists" errors when creating tables
- Improve robustness of database initialization for concurrent or repeated startup scenarios
- Add _compute_state_root helper function to compute Merkle Patricia Trie state root from account state
- Replace direct balance/nonce updates with state_transition.apply_transaction in block proposal
- Compute and set state_root for both regular blocks and genesis block
- Add state root verification in sync.py after importing blocks
- Add application-layer database validation with DatabaseOperationValidator class
- Change file mode from 644 to 755 for all project files
- Add chain_id parameter to get_balance RPC endpoint with default "ait-devnet"
- Rename Miner.extra_meta_data to extra_metadata for consistency
