treewide: better cross-device sync capabilities; in-database storage

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Id99798df6f7e4470caae8a193c2654aa6a6a6964

migrations/sqlite/V16__sync_system.sql

@@ -0,0 +1,117 @@
+-- V16: Cross-Device Sync System
+-- Adds device registration, change tracking, and chunked upload support
+
+-- Sync devices table
+CREATE TABLE sync_devices (
+    id TEXT PRIMARY KEY NOT NULL,
+    user_id TEXT NOT NULL,
+    name TEXT NOT NULL,
+    device_type TEXT NOT NULL,
+    client_version TEXT NOT NULL,
+    os_info TEXT,
+    device_token_hash TEXT NOT NULL UNIQUE,
+    last_sync_at TEXT,
+    last_seen_at TEXT NOT NULL,
+    sync_cursor INTEGER DEFAULT 0,
+    enabled INTEGER NOT NULL DEFAULT 1,
+    created_at TEXT NOT NULL,
+    updated_at TEXT NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+CREATE INDEX idx_sync_devices_user ON sync_devices(user_id);
+CREATE INDEX idx_sync_devices_token ON sync_devices(device_token_hash);
+
+-- Sync log table - tracks all changes for sync
+CREATE TABLE sync_log (
+    id TEXT PRIMARY KEY NOT NULL,
+    sequence INTEGER NOT NULL UNIQUE,
+    change_type TEXT NOT NULL,
+    media_id TEXT,
+    path TEXT NOT NULL,
+    content_hash TEXT,
+    file_size INTEGER,
+    metadata_json TEXT,
+    changed_by_device TEXT,
+    timestamp TEXT NOT NULL,
+    FOREIGN KEY (media_id) REFERENCES media_items(id) ON DELETE SET NULL,
+    FOREIGN KEY (changed_by_device) REFERENCES sync_devices(id) ON DELETE SET NULL
+);
+
+CREATE INDEX idx_sync_log_sequence ON sync_log(sequence);
+CREATE INDEX idx_sync_log_path ON sync_log(path);
+CREATE INDEX idx_sync_log_timestamp ON sync_log(timestamp);
+
+-- Sequence counter for sync log
+CREATE TABLE sync_sequence (
+    id INTEGER PRIMARY KEY CHECK (id = 1),
+    current_value INTEGER NOT NULL DEFAULT 0
+);
+INSERT INTO sync_sequence (id, current_value) VALUES (1, 0);
+
+-- Device sync state - tracks sync status per device per file
+CREATE TABLE device_sync_state (
+    device_id TEXT NOT NULL,
+    path TEXT NOT NULL,
+    local_hash TEXT,
+    server_hash TEXT,
+    local_mtime INTEGER,
+    server_mtime INTEGER,
+    sync_status TEXT NOT NULL,
+    last_synced_at TEXT,
+    conflict_info_json TEXT,
+    PRIMARY KEY (device_id, path),
+    FOREIGN KEY (device_id) REFERENCES sync_devices(id) ON DELETE CASCADE
+);
+
+CREATE INDEX idx_device_sync_status ON device_sync_state(device_id, sync_status);
+
+-- Upload sessions for chunked uploads
+CREATE TABLE upload_sessions (
+    id TEXT PRIMARY KEY NOT NULL,
+    device_id TEXT NOT NULL,
+    target_path TEXT NOT NULL,
+    expected_hash TEXT NOT NULL,
+    expected_size INTEGER NOT NULL,
+    chunk_size INTEGER NOT NULL,
+    chunk_count INTEGER NOT NULL,
+    status TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    expires_at TEXT NOT NULL,
+    last_activity TEXT NOT NULL,
+    FOREIGN KEY (device_id) REFERENCES sync_devices(id) ON DELETE CASCADE
+);
+
+CREATE INDEX idx_upload_sessions_device ON upload_sessions(device_id);
+CREATE INDEX idx_upload_sessions_status ON upload_sessions(status);
+CREATE INDEX idx_upload_sessions_expires ON upload_sessions(expires_at);
+
+-- Upload chunks - tracks received chunks
+CREATE TABLE upload_chunks (
+    upload_id TEXT NOT NULL,
+    chunk_index INTEGER NOT NULL,
+    offset INTEGER NOT NULL,
+    size INTEGER NOT NULL,
+    hash TEXT NOT NULL,
+    received_at TEXT NOT NULL,
+    PRIMARY KEY (upload_id, chunk_index),
+    FOREIGN KEY (upload_id) REFERENCES upload_sessions(id) ON DELETE CASCADE
+);
+
+-- Sync conflicts
+CREATE TABLE sync_conflicts (
+    id TEXT PRIMARY KEY NOT NULL,
+    device_id TEXT NOT NULL,
+    path TEXT NOT NULL,
+    local_hash TEXT NOT NULL,
+    local_mtime INTEGER NOT NULL,
+    server_hash TEXT NOT NULL,
+    server_mtime INTEGER NOT NULL,
+    detected_at TEXT NOT NULL,
+    resolved_at TEXT,
+    resolution TEXT,
+    FOREIGN KEY (device_id) REFERENCES sync_devices(id) ON DELETE CASCADE
+);
+
+CREATE INDEX idx_sync_conflicts_device ON sync_conflicts(device_id);
+CREATE INDEX idx_sync_conflicts_unresolved ON sync_conflicts(device_id, resolved_at) WHERE resolved_at IS NULL;