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Claude-Code

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Claude-Code
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19-session-persistence

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Session Persistence & Storage Architecture

Overview

Sessions are the unit of durability in Claude Code. Every conversation is recorded, compressed, and stored for later retrieval, resume, or analysis. This system enables long-term memory and conversation recovery.

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0000_start_here_index_and_recommended_reading_order.md
0100_project_overview_tech_stack_runtime_modes_and_folder_map.md
0200_startup_flow_entry_points_and_cold_start_sequence.md
0300_codebase_modules_layers_state_models_and_schemas.md
0400_system_architecture_and_design_rationale.md
0500_interactive_repl_request_flow_end_to_end.md
0600_headless_sdk_and_print_mode_request_flow_end_to_end.md
0700_mcp_integration_connection_and_tool_call_flow.md
0800_external_services_sdks_storage_and_local_dependencies.md
0900_environment_variables_settings_feature_flags_and_failure_modes.md
1000_non_obvious_patterns_gotchas_and_debugging_traps.md
1100_full_codebase_file_inventory_grouped_by_directory.md
kimi
00-overview.md
01-entrypoints.md
02-state-management.md
03-query-system.md
04-tools-system.md
05-tasks-system.md
06-ui-components.md
07-bridge-remote.md
08-services.md
09-skills-plugins.md
10-commands.md
11-testing-architecture.md
12-permission-system.md
13-build-system.md
14-ink-internals.md
15-git-internals.md
16-context-compaction.md
17-vim-mode.md
18-mailbox-notifications.md
19-session-persistence.md
20-hooks-system.md
21-error-recovery.md
README.md
qwen
00-overview.md
01-entry-points.md
02-query-engine.md
03-tools-and-tasks.md
04-commands-and-skills.md
05-state-management.md
06-ink-rendering.md
07-bridge-remote.md
08-mcp-services.md
09-services-overview.md
10-multi-agent.md
11-system-prompt-constants.md
12-tool-interface.md
13-memory-system.md
14-buddy-companion.md
15-keybindings.md
16-stop-hooks.md
17-vim-mode.md
18-upstreamproxy.md
19-cost-tracking-history.md
20-contexts-styles-onboarding.md
21-hooks.md
22-screens.md
tweets-explain
claude-code-memory-analysis.md
compact
memory-system
agentic-architecture

Core Files

FilePurpose
utils/sessionStorage.tsSession persistence API
utils/conversationRecovery.tsCrash recovery
utils/sessionStorage/index.tsStorage backends
commands/resume/index.ts/resume command
commands/session/index.ts/session command

Storage Format: JSONL

Sessions use JSON Lines format - one JSON object per line for append-only efficiency.

Plain text
Transcript Format (.jsonl)
JSON
Metadata Format (.meta.json)
JSON

Session Storage API

TypeScript
Implementation
TypeScript

Session Registry

Index Management
TypeScript

Conversation Recovery

Crash Detection & Recovery
TypeScript

Resume Flow

The /resume Command
TypeScript
Lazy Loading Large Sessions
TypeScript

Session Analytics

Usage Statistics
TypeScript

Key Design Decisions

  1. JSONL for Append-Only: Efficient for streaming writes, no rewrite on each message
  2. Separate Metadata: Fast index operations without parsing full transcripts
  3. Lazy Loading: Large sessions load recent messages first
  4. Crash Recovery: Detect interrupted sessions and offer recovery
  5. Compression: Archive old sessions to save disk space

Storage Location

Bash