Trainlog

Trainlog is a local-first workout and body-tracking system with two user interfaces:

• a native Android application optimized for fast data entry during training;
• a C17/Notcurses TUI used for durable history, editing, visualization, statistics, and synchronization.

The desktop SQLite database is the canonical long-term history. Android keeps its own local SQLite database so recording remains usable independently from the desktop.

Current status

TRAINLOG_FORMAT_V1=FROZEN

DESKTOP_SCHEMA_V5=PASS
ANDROID_LOCAL_WORKFLOWS=PASS
ANDROID_LOCAL_DATABASE_V4=PASS
ANDROID_SESSION_DRAFT_V1=PASS
EXERCISE_EDIT_V1=PASS
ANDROID_BANNER_PARITY_V1=PASS

VARIABLE_REPETITION_SETS=PASS
CONTINUOUS_ACTIVITY_TRACKING=PASS

DIRECT_MTP_TRANSPORT=PASS
COMMON_SYNC_ENGINE=PASS
TRAINLOG_SYNCD=PASS
ANDROID_TRIGGERED_SYNC=PASS
ANDROID_SYNC_RECEIPT=PASS
BIDIRECTIONAL_SYNC_V1=PASS

DESKTOP_TESTS=22/22 PASS
ANDROID_BUILD=PASS

Architecture

                Android application
                local SQLite store
                       |
             automatic mobile snapshot
                       |
                       v
        Download/Trainlog on Android storage
                       |
                       | direct MTP / libmtp
                       v
                trainlog_sync_run()
                  /             \
                 /               \
        Android -> PC         PC -> Android
        snapshot import       catalog publish
                 \               /
                  \             /
                   sync receipt
                       |
                       v
                    Android

Desktop TUI --------------------+
    |                           |
    +-- same sync engine -------+
    |
    v
desktop SQLite
canonical long-term history

No SQLite database file is copied between devices. The desktop does not require a GVFS/FUSE mount of the phone.

Exercise model

Trainlog does not infer behavior from exercise names.

recording_mode = SETS | CONTINUOUS
tracking_mode  = REPS | DURATION
data_fields    = SPEED_KMH | DISTANCE_KM

Valid model-v1 combinations are:

SETS + REPS
SETS + DURATION
CONTINUOUS + DURATION

Actual repetition sets are stored independently. Compact input supports:

5x10
4,5,6,7,8,9,10,9,8,7,6,5,4
4..10..4

Repository layout

android/        native Kotlin/Compose Android client
tui/            C17 Notcurses desktop application and core
docs/           canonical project documentation
format/         frozen Trainlog JSON v1 schema material
examples/       valid frozen-format examples
tests/          fixtures and cross-component tests
tools/          validators, import/export helpers, sync daemon tooling

Desktop build and validation

meson setup --reconfigure build
meson compile -C build
meson test -C build --print-errorlogs

python tools/validate_json.py
python tools/validate_import_contract.py

git diff --check

Android build

Android keeps one durable in-progress workout in its local SQLite database. Home offers Reprendre la séance en cours after navigation, app switching, Activity recreation, process death or force-stop/relaunch. Added exercises and raw unfinished form text are retained. Removing an exercise affects only the draft; abandoning the draft requires confirmation. Final save atomically creates completed history and clears the draft. Drafts never enter mobile export or desktop synchronization as completed sessions.

Schema v4 migrates additively from v3, preserving existing capture data. See Android behavior and validation.

Exercises can be renamed in place from Android. The ex_<uuid-v4> identity is unchanged; completed history, an active draft, and synchronization therefore continue to resolve the same logical exercise. Referenced profiles are locked; only unreferenced catalog exercises may change their recording/tracking profile.

The local Android SDK is intentionally not committed. Configure it with either ANDROID_HOME or android/local.properties.

Example:

cd android

printf 'sdk.dir=%s\n' "$HOME/Android/Sdk" > local.properties

JAVA_HOME=/usr/lib/jvm/java-17-openjdk \
./gradlew assembleDebug

Android-triggered synchronization

Build the desktop first, then install the user service:

bash tools/install_syncd_user.sh

Check it with:

systemctl --user is-active trainlog-syncd.service
tail -f ~/.local/state/trainlog/syncd.log

On Android:

Sync
-> Synchroniser maintenant

The request is consumed by trainlog-syncd, the shared bidirectional engine runs, a receipt is returned to Android, and the PC catalog is applied locally.

Documentation

• docs/current_state.md: compact canonical implementation snapshot;
• docs/architecture.md: component and ownership boundaries;
• docs/exercise_data_model.md: exercise semantics;
• docs/database.md: desktop SQLite schema and migrations;
• docs/android.md: Android behavior;
• docs/tui.md: desktop TUI behavior;
• docs/sync_exchange.md: MTP synchronization artifacts and protocol;
• docs/exchange_format.md: frozen Trainlog JSON v1 contract;
• docs/tests.md: validation strategy;
• docs/roadmap.md: completed gates and future cursor;
• AGENTS.md: development contract.

Development principles

• local-first;
• no mandatory cloud account;
• user-owned data;
• versioned persistent and exchange formats;
• stable identities;
• idempotent synchronization;
• no fake data representation to force incompatible models together;
• strict compiler warnings;
• documentation and tests are part of feature completion.

Measured max

Explicit max_test sessions are the only source of measured maxima.

Ordinary training best sets remain ordinary performance even when they exceed a previous max-test result.

The desktop exercise catalog exposes a separate measured-max view with current result, same-mode record, test history, a dedicated graph, and 60/70/80/90% working loads for external resistance. Working loads are rounded to a selectable practical increment and are not calculated for assistance.

Android can explicitly save a session as Entraînement or Test max.

MEASURED_MAX_V1=PASS
WORKING_LOAD_PERCENTAGES=PASS
ANDROID_MAX_TEST_SESSION=PASS

Body analytics

Body analytics are desktop-only. Android remains a capture client.

The TUI derives descriptive ratios, left/right asymmetry, and an optional circumference-based body-fat estimate from real body observations.

The estimate requires a local desktop-only analytics profile containing the formula branch and height. Estimated fat mass and lean mass are calculated only when a real body weight is present.

Estimated values are never persisted as direct measurements.

BODY_ANALYTICS_V1=PASS
BODY_COMPOSITION_ESTIMATE=PASS
BODY_PROPORTION_RATIOS=PASS
BODY_SYMMETRY_ANALYTICS=PASS
DESKTOP_TESTS=22/22 PASS