Files

1877 lines
70 KiB
Python

"""Offline, non-destructive recovery for a damaged Hermes session database.
The recovery path deliberately avoids in-place repair:
* the supplied source database is never opened by SQLite;
* the source file and any WAL/SHM/rollback-journal sidecars are copied into a
disposable working directory first;
* canonical rows are copied into a newly initialized current-schema database;
* derived FTS tables and migration bookkeeping are rebuilt, not copied; and
* the recovered database is never installed over the active database.
"""
from __future__ import annotations
import json
import os
import shutil
import sqlite3
import tempfile
from pathlib import Path
from typing import Any, Callable, Optional
from hermes_state import (
FTS_STORAGE_VERSION,
SCHEMA_VERSION,
SessionDB,
_db_opens_cleanly,
)
ProgressCallback = Callable[[dict[str, Any]], None]
_CANONICAL_TABLES = (
"system_prompts",
"sessions",
"messages",
"session_model_usage",
"compression_locks",
"gateway_routing",
"async_delegations",
)
_TOPIC_TABLES = (
"telegram_dm_topic_mode",
"telegram_dm_topic_bindings",
)
def _init_delivery_ledger_schema(conn: sqlite3.Connection) -> None:
from gateway.delivery_ledger import _initialize_schema
_initialize_schema(conn)
# Tables that live in state.db but are created lazily by a gateway module on
# first use, so base ``SessionDB`` never creates them on a fresh destination.
# Every entry maps the table to the initializer that owns its DDL; recovery
# creates the table on the destination before copying, so owed rows survive
# instead of silently vanishing from a "complete" salvage (#100313, #86236).
# Add new lazily-created state.db tables HERE, never as one-off ``if table ==``
# branches.
_AUXILIARY_TABLE_SCHEMAS: dict[str, Callable[[sqlite3.Connection], None]] = {
"delivery_obligations": _init_delivery_ledger_schema,
}
_AUXILIARY_TABLES = tuple(_AUXILIARY_TABLE_SCHEMAS)
_INVENTORY_TABLES = (
*_CANONICAL_TABLES,
"state_meta",
*_TOPIC_TABLES,
*_AUXILIARY_TABLES,
)
# These values describe derived indexes or the schema that owns an optional
# table. A fresh destination must generate them from its own current schema.
_GENERATED_META_KEYS = frozenset({
"fts_storage_version",
"fts_optimize_available",
"fts_rebuild_high_water",
"fts_rebuild_progress",
"fts_cjk_stale",
"fts_cjk_rebuild_high_water",
"fts_cjk_rebuild_progress",
"telegram_dm_topic_schema_version",
})
_SIDECAR_SUFFIXES = ("", "-wal", "-shm", "-journal")
_MINIMUM_SPACE_HEADROOM = 256 * 1024 * 1024
_MAX_SALVAGE_RANGE_QUERIES = 10_000
_MIN_SQLITE_ROWID = -(2**63)
_MAX_SQLITE_ROWID = 2**63 - 1
class SessionRecoveryError(RuntimeError):
"""Base error for offline session recovery."""
class SessionRecoverySafetyError(SessionRecoveryError):
"""Raised before recovery when a path or overwrite guard fails."""
class SessionRecoverySourceError(SessionRecoveryError):
"""Raised when the source cannot provide the required canonical tables."""
def _sidecar_path(db_path: Path, suffix: str) -> Path:
return db_path if not suffix else db_path.with_name(db_path.name + suffix)
def _resolved_output_path(path: Path) -> Path:
"""Resolve a not-yet-created output path without requiring it to exist."""
parent = path.expanduser().parent.resolve(strict=True)
return parent / path.name
def _validate_paths(
source_path: Path,
output_path: Optional[Path] = None,
work_dir: Optional[Path] = None,
) -> tuple[Path, Optional[Path], Path]:
source = source_path.expanduser().resolve(strict=True)
if not source.is_file():
raise SessionRecoverySafetyError(f"Source is not a file: {source}")
output: Optional[Path] = None
if output_path is not None:
output = _resolved_output_path(output_path)
protected = {
_sidecar_path(source, suffix).resolve(strict=False)
for suffix in _SIDECAR_SUFFIXES
}
if output.resolve(strict=False) in protected:
raise SessionRecoverySafetyError(
"The recovery output must not be the source database or one of "
"its journal sidecars."
)
for suffix in _SIDECAR_SUFFIXES:
candidate = _sidecar_path(output, suffix)
if os.path.lexists(candidate):
raise SessionRecoverySafetyError(
f"Refusing to overwrite existing recovery output: {candidate}"
)
work_root = (
work_dir.expanduser().resolve(strict=True)
if work_dir is not None
else (output.parent if output is not None else source.parent)
)
if not work_root.is_dir():
raise SessionRecoverySafetyError(
f"Recovery work directory is not a directory: {work_root}"
)
return source, output, work_root
def _source_fingerprint(source: Path) -> dict[str, dict[str, int]]:
fingerprint: dict[str, dict[str, int]] = {}
for suffix in _SIDECAR_SUFFIXES:
path = _sidecar_path(source, suffix)
if not path.exists():
continue
stat = path.stat()
fingerprint[suffix or "main"] = {
"size": stat.st_size,
"mtime_ns": stat.st_mtime_ns,
}
return fingerprint
def _format_bytes(value: int) -> str:
units = ("B", "KiB", "MiB", "GiB", "TiB")
amount = float(value)
for unit in units:
if amount < 1024 or unit == units[-1]:
return f"{amount:.1f} {unit}"
amount /= 1024
return f"{value} B"
def _same_filesystem(left: Path, right: Path) -> bool:
try:
return os.stat(left).st_dev == os.stat(right).st_dev
except OSError:
# Existing directories were already required by _validate_paths. This
# fallback is defensive for platforms with incomplete st_dev support.
return left.anchor.casefold() == right.anchor.casefold()
def _disk_space_preflight(
source: Path,
work_root: Path,
output_parent: Optional[Path],
) -> dict[str, Any]:
"""Require space for the disposable bundle, output, and safety headroom."""
bundle_bytes = sum(
_sidecar_path(source, suffix).stat().st_size
for suffix in _SIDECAR_SUFFIXES
if _sidecar_path(source, suffix).exists()
)
# The v23 external-content rebuild is normally substantially smaller than
# a legacy database, but using the complete source bundle as the estimate
# avoids betting the user's disk on that expectation.
output_allowance = bundle_bytes if output_parent is not None else 0
headroom = max(
_MINIMUM_SPACE_HEADROOM,
int((bundle_bytes + output_allowance) * 0.05),
)
work_free = int(shutil.disk_usage(work_root).free)
report: dict[str, Any] = {
"source_bundle_bytes": bundle_bytes,
"estimated_output_bytes": output_allowance,
"headroom_bytes": headroom,
"work_dir": str(work_root),
"work_dir_free_bytes": work_free,
}
if output_parent is None or _same_filesystem(work_root, output_parent):
required = bundle_bytes + output_allowance + headroom
report["shared_filesystem"] = True
report["work_dir_required_bytes"] = required
if work_free < required:
raise SessionRecoverySafetyError(
"Not enough free disk space for a safe recovery copy: "
f"{_format_bytes(work_free)} available at {work_root}, "
f"{_format_bytes(required)} required "
f"({_format_bytes(bundle_bytes)} source bundle + "
f"{_format_bytes(output_allowance)} output allowance + "
f"{_format_bytes(headroom)} headroom). Use --work-dir or "
"--output on a filesystem with more free space."
)
return report
output_free = int(shutil.disk_usage(output_parent).free)
work_required = bundle_bytes + headroom
output_required = output_allowance + headroom
report.update({
"shared_filesystem": False,
"work_dir_required_bytes": work_required,
"output_dir": str(output_parent),
"output_dir_free_bytes": output_free,
"output_dir_required_bytes": output_required,
})
shortages: list[str] = []
if work_free < work_required:
shortages.append(
f"{work_root}: {_format_bytes(work_free)} available, "
f"{_format_bytes(work_required)} required"
)
if output_free < output_required:
shortages.append(
f"{output_parent}: {_format_bytes(output_free)} available, "
f"{_format_bytes(output_required)} required"
)
if shortages:
raise SessionRecoverySafetyError(
"Not enough free disk space for safe recovery: "
+ "; ".join(shortages)
+ ". Choose work/output filesystems with more free space."
)
return report
def _copy_source_bundle(source: Path, snapshot_dir: Path) -> tuple[Path, list[str]]:
"""Copy the source DB bundle aside so SQLite never opens the original.
The whole copy runs inside ``offline_file_access``, which holds the
connection-lifecycle lock for its duration. Checking for a live connection
and *then* copying would be a check/use race: a connection could open in
that window, and the copy's ``close()`` would cancel its POSIX advisory
locks -- the failure class ``hermes_cli.sqlite_safe_read`` exists to
prevent (see #71724). Holding the lock means no connection can appear
mid-copy, across the main file and every sidecar.
Recovery normally runs as its own short-lived CLI process against an
offline/quarantined file, so the refusal should never fire; the guard
keeps this path consistent with ``hermes_state._backup_db_file``.
"""
from hermes_cli.sqlite_safe_read import LiveConnectionError, offline_file_access
snapshot_source = snapshot_dir / source.name
copied: list[str] = []
try:
with offline_file_access(source, what="snapshot"):
for suffix in _SIDECAR_SUFFIXES:
source_part = _sidecar_path(source, suffix)
if not source_part.exists():
continue
destination_part = _sidecar_path(snapshot_source, suffix)
shutil.copy2(source_part, destination_part)
copied.append(destination_part.name)
except LiveConnectionError as exc:
raise SessionRecoverySafetyError(str(exc)) from exc
return snapshot_source, copied
def _table_columns(conn: sqlite3.Connection, table: str) -> list[str]:
return [str(row[1]) for row in conn.execute(f'PRAGMA table_info("{table}")')]
def _table_inventory(
conn: sqlite3.Connection,
table: str,
) -> dict[str, Any]:
result: dict[str, Any] = {"available": False, "columns": [], "rows": None}
try:
columns = _table_columns(conn, table)
if not columns:
return result
result["available"] = True
result["columns"] = columns
result["rows"] = int(
conn.execute(f'SELECT COUNT(*) FROM "{table}"').fetchone()[0]
)
except sqlite3.DatabaseError as exc:
result["error"] = str(exc)
return result
def _inspect_connection(conn: sqlite3.Connection) -> dict[str, Any]:
conn.execute("PRAGMA writable_schema=ON")
report: dict[str, Any] = {"tables": {}, "errors": [], "warnings": []}
try:
row = conn.execute("PRAGMA journal_mode").fetchone()
report["journal_mode"] = str(row[0]).lower() if row else None
except sqlite3.DatabaseError as exc:
report["journal_mode"] = None
# Journal metadata is useful context but not canonical session data.
# A damaged journal pragma must not block rows that are still readable.
report["warnings"].append(f"journal mode: {exc}")
for table in _INVENTORY_TABLES:
report["tables"][table] = _table_inventory(conn, table)
for required in ("sessions", "messages"):
table_report = report["tables"][required]
if not table_report.get("available") or table_report.get("rows") is None:
report["errors"].append(
f"required table {required} is not completely readable"
)
report["recoverable"] = not report["errors"]
return report
def _snapshot_and_inspect(
source: Path,
work_root: Path,
) -> tuple[tempfile.TemporaryDirectory[str], Path, dict[str, Any]]:
before = _source_fingerprint(source)
temp_dir = tempfile.TemporaryDirectory(
prefix="hermes-session-recovery-",
dir=str(work_root),
)
snapshot_dir = Path(temp_dir.name)
try:
snapshot_source, copied = _copy_source_bundle(source, snapshot_dir)
after = _source_fingerprint(source)
if before != after:
raise SessionRecoverySafetyError(
"The source database bundle changed while it was being copied. "
"Stop every Hermes process using this profile and retry. "
"This includes the interactive `hermes` CLI session this "
"command may have been launched from: a running parent CLI "
"writes session bookkeeping (compression ticks, context "
"tracking) to state.db in the background and counts as a "
"Hermes process even after the gateway is stopped. Run the "
"recovery from a fresh shell with no `hermes` session open, "
"or point --source at an immutable snapshot copy of the "
"database."
)
conn = sqlite3.connect(
str(snapshot_source),
isolation_level=None,
timeout=1.0,
)
try:
inspection = _inspect_connection(conn)
finally:
conn.close()
inspection["source_bundle"] = copied
inspection["source_fingerprint"] = before
return temp_dir, snapshot_source, inspection
except BaseException:
temp_dir.cleanup()
raise
def inspect_session_database(
source_path: Path,
*,
work_dir: Optional[Path] = None,
) -> dict[str, Any]:
"""Inspect canonical table readability without opening the source itself."""
source, _, work_root = _validate_paths(source_path, work_dir=work_dir)
disk_space = _disk_space_preflight(source, work_root, None)
temp_dir, _, inspection = _snapshot_and_inspect(source, work_root)
try:
return {
"operation": "inspect",
"source": str(source),
"disk_space": disk_space,
**inspection,
"source_unchanged": _source_fingerprint(source)
== inspection["source_fingerprint"],
}
finally:
temp_dir.cleanup()
def _ensure_auxiliary_destination_schema(
destination: sqlite3.Connection,
table: str,
) -> None:
"""Create a lazy auxiliary table on the recovered destination.
Recovery initializes the destination through base ``SessionDB``, which
does not create gateway-owned tables. Copying into a missing dest table
would report ``missing`` / ``no compatible columns`` and drop the rows.
"""
initialize = _AUXILIARY_TABLE_SCHEMAS.get(table)
if initialize is None:
raise SessionRecoverySafetyError(
f"no destination schema initializer registered for table {table!r}"
)
initialize(destination)
def _copy_table(
source: sqlite3.Connection,
destination: sqlite3.Connection,
table: str,
*,
chunk_size: int,
progress_cb: Optional[ProgressCallback],
source_rows: Optional[int],
) -> dict[str, Any]:
source_columns = _table_columns(source, table)
destination_columns = _table_columns(destination, table)
columns = [column for column in destination_columns if column in source_columns]
result: dict[str, Any] = {
"source_rows": source_rows,
"copied_rows": 0,
"columns": columns,
}
if not source_columns:
result["status"] = "missing"
return result
if not columns:
result["status"] = "failed"
result["error"] = "source and destination have no compatible columns"
return result
quoted = ", ".join(f'"{column}"' for column in columns)
placeholders = ", ".join("?" for _ in columns)
select_sql = f'SELECT {quoted} FROM "{table}"'
insert_prefix = "INSERT OR REPLACE" if table == "state_meta" else "INSERT"
insert_sql = f'{insert_prefix} INTO "{table}" ({quoted}) VALUES ({placeholders})'
try:
cursor = source.execute(select_sql)
while True:
rows = cursor.fetchmany(chunk_size)
if not rows:
break
destination.execute("BEGIN IMMEDIATE")
try:
destination.executemany(insert_sql, rows)
destination.execute("COMMIT")
except BaseException:
destination.execute("ROLLBACK")
raise
result["copied_rows"] += len(rows)
if progress_cb is not None:
progress_cb({
"table": table,
"copied_rows": result["copied_rows"],
"source_rows": source_rows,
})
except sqlite3.DatabaseError as exc:
result["status"] = "partial" if result["copied_rows"] else "failed"
result["error"] = str(exc)
return result
result["status"] = (
"complete"
if source_rows is None or result["copied_rows"] == source_rows
else "partial"
)
if result["status"] == "partial":
result["error"] = (
f"copied {result['copied_rows']} of {source_rows} readable rows"
)
return result
def _append_skipped_range(
ranges: list[dict[str, Any]],
low: int,
high: int,
error: str,
) -> None:
"""Record skipped rowid ranges without producing one entry per row."""
if (
ranges
and ranges[-1]["high"] + 1 == low
and ranges[-1]["error"] == error
):
ranges[-1]["high"] = high
return
ranges.append({"low": low, "high": high, "error": error})
def _salvage_rowid_bounds(
source: sqlite3.Connection,
table: str,
) -> dict[str, Any]:
"""Find the readable rowid edges without scanning the complete table."""
result: dict[str, Any] = {"errors": [], "fallback_edges": []}
rows: dict[str, Optional[int]] = {"low": None, "high": None}
directions = (("low", "ASC"), ("high", "DESC"))
for edge, direction in directions:
try:
row = source.execute(
f'SELECT rowid FROM "{table}" ORDER BY rowid {direction} LIMIT 1'
).fetchone()
if row is not None:
rows[edge] = int(row[0])
except sqlite3.DatabaseError as exc:
result["errors"].append(f"{edge} rowid: {exc}")
if rows["low"] is None and rows["high"] is None and not result["errors"]:
result["empty"] = True
return result
if rows["low"] is None and rows["high"] is None:
result["unavailable"] = True
return result
# A damaged edge can prevent one of the ordered probes from completing.
# Keep the other readable edge and bound the missing side by SQLite's
# rowid domain. Range bisection can then approach the surviving data
# without assuming that user-created databases contain only positive IDs.
if rows["low"] is None:
rows["low"] = _MIN_SQLITE_ROWID
result["fallback_edges"].append("low")
if rows["high"] is None:
rows["high"] = _MAX_SQLITE_ROWID
result["fallback_edges"].append("high")
result["low"] = rows["low"]
result["high"] = rows["high"]
return result
def _probe_populated_edge(
source: sqlite3.Connection,
table: str,
*,
edge: str,
anchor: int,
) -> dict[str, Any]:
"""Find a finite bound for a damaged rowid edge (issue #80205).
When an ordered edge probe fails, :func:`_salvage_rowid_bounds` used to
substitute the whole SQLite rowid domain. Range bisection then burned the
entire ``_MAX_SALVAGE_RANGE_QUERIES`` budget subdividing an enormous
synthetic tail that could not contain real rows — and once the budget was
gone, rows that were still readable were silently recorded as skipped.
This gallops outward from the readable ``anchor`` edge with exponentially
growing offsets. A probe that cleanly reports "no rows beyond X" caps the
domain at X; a probe that errors (its b-tree path crosses the damage) or
finds a row keeps growing. At most ~64 probes per edge, so the cap costs
a bounded, tiny slice of the salvage budget instead of all of it.
"""
ascending = edge == "high"
comparison = ">" if ascending else "<"
probe_sql = (
f'SELECT rowid FROM "{table}" WHERE rowid {comparison} ? '
f'ORDER BY rowid {"ASC" if ascending else "DESC"} LIMIT 1'
)
domain_limit = _MAX_SQLITE_ROWID if ascending else _MIN_SQLITE_ROWID
result: dict[str, Any] = {"edge": edge, "probes": 0, "capped": False}
position = anchor
span = 1
while True:
candidate = position + span if ascending else position - span
if (ascending and candidate >= domain_limit) or (
not ascending and candidate <= domain_limit
):
# No clean empty-tail answer before the domain edge; keep the
# domain fallback rather than inventing a bound.
result["bound"] = domain_limit
return result
result["probes"] += 1
try:
row = source.execute(probe_sql, (candidate,)).fetchone()
except sqlite3.DatabaseError:
# Damage on the probe path — inconclusive, widen further.
span *= 2
continue
if row is None:
# Clean answer: nothing beyond ``candidate``. The salvageable
# data ends at or before it, so the synthetic domain tail is
# provably empty and need not be bisected at all.
result["bound"] = candidate
result["capped"] = True
return result
# Rows exist beyond the candidate; advance the anchor. The span keeps
# doubling (never resets) so the whole gallop stays O(log range).
position = int(row[0])
span *= 2
def _copy_table_salvage(
source: sqlite3.Connection,
destination: sqlite3.Connection,
table: str,
*,
chunk_size: int,
progress_cb: Optional[ProgressCallback],
source_rows: Optional[int],
insert_prefix: str = "INSERT",
row_filter: Optional[
Callable[[tuple[Any, ...], tuple[str, ...]], bool]
] = None,
) -> dict[str, Any]:
"""Best-effort rowid-range copy that continues past damaged source pages."""
source_columns = _table_columns(source, table)
destination_columns = _table_columns(destination, table)
columns = [column for column in destination_columns if column in source_columns]
result: dict[str, Any] = {
"mode": "rowid_range_salvage",
"source_rows": source_rows,
"copied_rows": 0,
"excluded_rows": 0,
"columns": columns,
"range_queries": 0,
"exact_lookup_recovered": 0,
"skipped_rowid_ranges": [],
}
if not source_columns:
result["status"] = "missing"
return result
if not columns:
result["status"] = "failed"
result["error"] = "source and destination have no compatible columns"
return result
bounds = _salvage_rowid_bounds(source, table)
result["rowid_bounds"] = bounds
if bounds.get("empty"):
result["status"] = "complete"
return result
if bounds.get("low") is None or bounds.get("high") is None:
result["status"] = "failed"
details = "; ".join(bounds.get("errors") or [])
result["error"] = "could not determine a rowid range for salvage"
if details:
result["error"] += f": {details}"
return result
# Issue #80205: a damaged ordered edge probe used to substitute the whole
# SQLite rowid domain, and bisecting that synthetic tail exhausted the
# range-query budget while readable tail rows were still waiting to be
# copied. Gallop outward from the surviving edge for a finite bound first.
fallback_edges = bounds.get("fallback_edges") or []
if fallback_edges:
bounds["edge_probes"] = []
if "high" in fallback_edges and bounds.get("low") is not None:
probe = _probe_populated_edge(
source, table, edge="high", anchor=int(bounds["low"])
)
bounds["edge_probes"].append(probe)
if probe["capped"]:
bounds["high"] = int(probe["bound"])
if "low" in fallback_edges and bounds.get("high") is not None:
probe = _probe_populated_edge(
source, table, edge="low", anchor=int(bounds["high"])
)
bounds["edge_probes"].append(probe)
if probe["capped"]:
bounds["low"] = int(probe["bound"])
quoted = ", ".join(f'"{column}"' for column in columns)
placeholders = ", ".join("?" for _ in columns)
select_sql = (
f'SELECT rowid, {quoted} FROM "{table}" '
"WHERE rowid BETWEEN ? AND ? ORDER BY rowid"
)
insert_sql = (
f'{insert_prefix} INTO "{table}" ({quoted}) VALUES ({placeholders})'
)
column_names = tuple(columns)
stopped_at_query_limit = False
exact_sql = f'SELECT {quoted} FROM "{table}" WHERE rowid = ?'
def recover_exact_rowid(rowid: int) -> bool:
"""Issue #80205: salvage one row by exact-key lookup.
A singleton range scan (``rowid BETWEEN x AND x ORDER BY rowid``)
must advance the cursor past ``x`` to prove the range is exhausted;
when the *next* cell or page is damaged that advance raises AFTER the
row was produced, and the driver discards the already-fetched row. An
equality lookup on the rowid stops at the hit, so the boundary row
directly before a damaged page — readable in the field case and by
SQLite's page-level ``.recover`` — is recovered instead of being
recorded as skipped.
"""
result["range_queries"] += 1
try:
row = source.execute(exact_sql, (rowid,)).fetchone()
except sqlite3.DatabaseError:
return False
if row is None:
return True # genuinely absent: nothing to skip
value = tuple(row)
if row_filter is not None and not row_filter(value, column_names):
result["excluded_rows"] += 1
return True
destination.execute("BEGIN IMMEDIATE")
try:
destination.execute(insert_sql, value)
destination.execute("COMMIT")
except BaseException:
destination.execute("ROLLBACK")
raise
result["copied_rows"] += 1
result["exact_lookup_recovered"] += 1
return True
def copy_range(low: int, high: int) -> None:
nonlocal stopped_at_query_limit
if low > high:
return
if result["range_queries"] >= _MAX_SALVAGE_RANGE_QUERIES:
stopped_at_query_limit = True
_append_skipped_range(
result["skipped_rowid_ranges"],
low,
high,
"salvage range query limit reached",
)
return
result["range_queries"] += 1
last_committed_rowid: Optional[int] = None
try:
cursor = source.execute(select_sql, (low, high))
while True:
fetched = cursor.fetchmany(chunk_size)
if not fetched:
return
values = [tuple(row[1:]) for row in fetched]
if row_filter is not None:
included = [
row for row in values if row_filter(row, column_names)
]
excluded_count = len(values) - len(included)
else:
included = values
excluded_count = 0
if included:
destination.execute("BEGIN IMMEDIATE")
try:
destination.executemany(insert_sql, included)
destination.execute("COMMIT")
except BaseException:
destination.execute("ROLLBACK")
raise
result["copied_rows"] += len(included)
result["excluded_rows"] += excluded_count
last_committed_rowid = int(fetched[-1][0])
if progress_cb is not None:
progress_cb({
"table": table,
"copied_rows": result["copied_rows"],
"source_rows": source_rows,
"skipped_ranges": len(result["skipped_rowid_ranges"]),
})
except sqlite3.DatabaseError as exc:
retry_low = (
last_committed_rowid + 1
if last_committed_rowid is not None
else low
)
if retry_low > high:
return
if retry_low == high:
if not recover_exact_rowid(retry_low):
_append_skipped_range(
result["skipped_rowid_ranges"],
retry_low,
high,
str(exc),
)
return
midpoint = retry_low + (high - retry_low) // 2
copy_range(retry_low, midpoint)
copy_range(midpoint + 1, high)
copy_range(int(bounds["low"]), int(bounds["high"]))
skipped_ranges = result["skipped_rowid_ranges"]
result["skipped_rowid_span"] = sum(
item["high"] - item["low"] + 1 for item in skipped_ranges
)
result["query_limit_reached"] = stopped_at_query_limit
if skipped_ranges:
result["status"] = "partial" if result["copied_rows"] else "failed"
result["error"] = (
f"{len(skipped_ranges)} rowid range(s) skipped"
)
elif (
source_rows is not None
and result["copied_rows"] + result["excluded_rows"] != source_rows
):
result["status"] = "partial"
result["error"] = (
f"copied {result['copied_rows']} and excluded "
f"{result['excluded_rows']} of {source_rows} source rows"
)
else:
result["status"] = "complete"
return result
def _copy_state_meta(
source: sqlite3.Connection,
destination: sqlite3.Connection,
*,
chunk_size: int,
progress_cb: Optional[ProgressCallback],
source_rows: Optional[int],
) -> dict[str, Any]:
source_columns = _table_columns(source, "state_meta")
destination_columns = _table_columns(destination, "state_meta")
result: dict[str, Any] = {
"source_meta_rows": source_rows,
"copied_rows": 0,
"columns": ["key", "value"],
"excluded_keys": sorted(_GENERATED_META_KEYS),
}
if not {"key", "value"}.issubset(source_columns):
result["status"] = "missing"
return result
if not {"key", "value"}.issubset(destination_columns):
result["status"] = "failed"
result["error"] = "destination state_meta schema is incomplete"
return result
placeholders = ", ".join("?" for _ in _GENERATED_META_KEYS)
filtered_source_rows: Optional[int] = None
try:
filtered_source_rows = int(
source.execute(
f"SELECT COUNT(*) FROM state_meta WHERE key NOT IN ({placeholders})",
tuple(_GENERATED_META_KEYS),
).fetchone()[0]
)
except sqlite3.DatabaseError:
# The copy loop below will return the concrete read error.
pass
try:
cursor = source.execute(
f"SELECT key, value FROM state_meta WHERE key NOT IN ({placeholders})",
tuple(_GENERATED_META_KEYS),
)
while True:
rows = cursor.fetchmany(chunk_size)
if not rows:
break
destination.execute("BEGIN IMMEDIATE")
try:
destination.executemany(
"INSERT OR REPLACE INTO state_meta(key, value) VALUES (?, ?)",
rows,
)
destination.execute("COMMIT")
except BaseException:
destination.execute("ROLLBACK")
raise
result["copied_rows"] += len(rows)
if progress_cb is not None:
progress_cb({
"table": "state_meta",
"copied_rows": result["copied_rows"],
"source_rows": filtered_source_rows,
})
except sqlite3.DatabaseError as exc:
result["status"] = "partial" if result["copied_rows"] else "failed"
result["error"] = str(exc)
return result
result["status"] = (
"complete"
if filtered_source_rows is None or result["copied_rows"] == filtered_source_rows
else "partial"
)
if result["status"] == "partial":
result["error"] = (
f"copied {result['copied_rows']} of {filtered_source_rows} readable rows"
)
return result
def _copy_state_meta_salvage(
source: sqlite3.Connection,
destination: sqlite3.Connection,
*,
chunk_size: int,
progress_cb: Optional[ProgressCallback],
source_rows: Optional[int],
) -> dict[str, Any]:
"""Salvage readable user metadata while regenerating derived FTS state.
Requires both ``key`` and ``value``, matching the non-partial
:func:`_copy_state_meta`. A damaged ``state_meta`` can retain one column
and lose the other; without this check a missing ``key`` raised
``ValueError`` from ``columns.index("key")`` and aborted the entire
partial recovery, and a missing ``value`` would have copied key-only rows
while reporting the table complete.
Status matters here. An unusable-but-PRESENT table reports ``failed``, not
``missing``: verification only escalates ``failed``/``partial`` into a
warning + ``loss_detected``, so reporting ``missing`` would silently drop
real metadata and still claim ``complete=True``. ``missing`` is reserved
for a table that genuinely is not there. Either way ``state_meta`` is
optional, so ``--allow-partial`` records the loss and carries on
recovering sessions and messages.
"""
source_columns = _table_columns(source, "state_meta")
destination_columns = _table_columns(destination, "state_meta")
if not source_columns:
# Genuinely absent from the source — nothing was lost.
return {
"mode": "rowid_range_salvage",
"source_meta_rows": source_rows,
"copied_rows": 0,
"columns": ["key", "value"],
"excluded_keys": sorted(_GENERATED_META_KEYS),
"status": "missing",
}
if not {"key", "value"}.issubset(source_columns):
# Present but unusable: this IS data loss and must be reported.
return {
"mode": "rowid_range_salvage",
"source_meta_rows": source_rows,
"copied_rows": 0,
"columns": ["key", "value"],
"excluded_keys": sorted(_GENERATED_META_KEYS),
"status": "failed",
"error": (
"source state_meta exists but is missing the key/value "
f"columns (found: {', '.join(source_columns) or 'none'})"
),
}
if not {"key", "value"}.issubset(destination_columns):
return {
"mode": "rowid_range_salvage",
"source_meta_rows": source_rows,
"copied_rows": 0,
"columns": ["key", "value"],
"excluded_keys": sorted(_GENERATED_META_KEYS),
"status": "failed",
"error": "destination state_meta schema is incomplete",
}
def keep_user_meta(
row: tuple[Any, ...],
columns: tuple[str, ...],
) -> bool:
return str(row[columns.index("key")]) not in _GENERATED_META_KEYS
result = _copy_table_salvage(
source,
destination,
"state_meta",
chunk_size=chunk_size,
progress_cb=progress_cb,
source_rows=source_rows,
insert_prefix="INSERT OR REPLACE",
row_filter=keep_user_meta,
)
result["source_meta_rows"] = result.pop("source_rows")
result["excluded_keys"] = sorted(_GENERATED_META_KEYS)
return result
def _reconstruct_missing_sessions(
destination: sqlite3.Connection,
) -> dict[str, Any]:
"""Recreate placeholder session rows for salvaged orphaned messages.
When the ``sessions`` b-tree is damaged worse than ``messages``, salvage
can recover the conversation text while recovering few or none of the
session rows that own it. Deleting those messages as "orphans" throws away
the only readable copy of the user's data — the exact opposite of what
``--allow-partial`` is for. A real report (July 2026) copied 20,817 of
20,824 messages and then removed every one of them, producing an output
with 0 sessions and 0 messages.
Instead, synthesize a minimal session row per orphaned ``session_id``
(only ``id``/``source``/``started_at`` are NOT NULL) so the messages stay
reachable and foreign keys hold. ``started_at`` is taken from the earliest
surviving message so ordering stays sane. Rows are marked with
``source='recovered'`` and a ``title`` that says so, because a fabricated
session must never be mistaken for an original.
"""
result: dict[str, Any] = {"sessions_reconstructed": 0, "messages_retained": 0}
if not _table_columns(destination, "sessions"):
return result
if not _table_columns(destination, "messages"):
return result
orphaned = destination.execute(
"SELECT m.session_id, MIN(m.timestamp), COUNT(*) "
"FROM messages AS m "
"WHERE m.session_id IS NOT NULL AND NOT EXISTS ("
"SELECT 1 FROM sessions WHERE sessions.id = m.session_id) "
"GROUP BY m.session_id"
).fetchall()
if not orphaned:
return result
title_sequence = 1
for session_id, first_timestamp, message_count in orphaned:
started_at = float(first_timestamp) if first_timestamp is not None else 0.0
while True:
title = (
f"[recovered {title_sequence}] "
"session metadata was unreadable"
)
title_sequence += 1
if (
destination.execute(
"SELECT 1 FROM sessions WHERE title = ? LIMIT 1",
(title,),
).fetchone()
is None
):
break
cursor = destination.execute(
"INSERT INTO sessions "
"(id, source, started_at, title, message_count) "
"VALUES (?, 'recovered', ?, ?, ?)",
(
session_id,
started_at,
title,
int(message_count),
),
)
if cursor.rowcount != 1:
raise sqlite3.IntegrityError(
f"failed to reconstruct missing session {session_id!r}"
)
result["sessions_reconstructed"] += 1
result["messages_retained"] += int(message_count)
return result
def _cleanup_partial_orphans(
destination: sqlite3.Connection,
) -> dict[str, Any]:
"""Reconcile references to sessions that could not be salvaged.
Messages are never discarded for lack of a session row: their owning
session is reconstructed as a placeholder first (see
:func:`_reconstruct_missing_sessions`). Only rows that remain orphaned
after that — and rows in tables carrying no recoverable user content —
are removed.
"""
result: dict[str, Any] = {
"session_prompt_refs_cleared": 0,
"system_prompts_removed": 0,
"sessions_parent_cleared": 0,
"sessions_reconstructed": 0,
"messages_retained": 0,
"messages_removed": 0,
"session_model_usage_removed": 0,
"compression_locks_removed": 0,
"telegram_dm_topic_bindings_removed": 0,
}
destination.execute("BEGIN IMMEDIATE")
try:
# Rebuild owners BEFORE any orphan deletion so salvaged conversation
# text is never dropped for want of a session row.
rebuilt = _reconstruct_missing_sessions(destination)
result["sessions_reconstructed"] = rebuilt["sessions_reconstructed"]
result["messages_retained"] = rebuilt["messages_retained"]
parent_count = int(
destination.execute(
"SELECT COUNT(*) FROM sessions AS child "
"WHERE child.parent_session_id IS NOT NULL "
"AND NOT EXISTS ("
"SELECT 1 FROM sessions AS parent "
"WHERE parent.id = child.parent_session_id)"
).fetchone()[0]
)
if parent_count:
destination.execute(
"UPDATE sessions SET parent_session_id = NULL "
"WHERE parent_session_id IS NOT NULL "
"AND NOT EXISTS ("
"SELECT 1 FROM sessions AS parent "
"WHERE parent.id = sessions.parent_session_id)"
)
result["sessions_parent_cleared"] = parent_count
prompt_ref_count = int(
destination.execute(
"SELECT COUNT(*) FROM sessions "
"WHERE system_prompt_hash IS NOT NULL "
"AND NOT EXISTS ("
"SELECT 1 FROM system_prompts "
"WHERE system_prompts.hash = sessions.system_prompt_hash)"
).fetchone()[0]
)
if prompt_ref_count:
destination.execute(
"UPDATE sessions SET system_prompt_hash = NULL "
"WHERE system_prompt_hash IS NOT NULL "
"AND NOT EXISTS ("
"SELECT 1 FROM system_prompts "
"WHERE system_prompts.hash = sessions.system_prompt_hash)"
)
result["session_prompt_refs_cleared"] = prompt_ref_count
unreferenced_prompt_count = int(
destination.execute(
"SELECT COUNT(*) FROM system_prompts "
"WHERE NOT EXISTS ("
"SELECT 1 FROM sessions "
"WHERE sessions.system_prompt_hash = system_prompts.hash)"
).fetchone()[0]
)
if unreferenced_prompt_count:
destination.execute(
"DELETE FROM system_prompts "
"WHERE NOT EXISTS ("
"SELECT 1 FROM sessions "
"WHERE sessions.system_prompt_hash = system_prompts.hash)"
)
result["system_prompts_removed"] = unreferenced_prompt_count
dependent_tables = (
("messages", "messages_removed"),
("session_model_usage", "session_model_usage_removed"),
("compression_locks", "compression_locks_removed"),
(
"telegram_dm_topic_bindings",
"telegram_dm_topic_bindings_removed",
),
)
for table, report_key in dependent_tables:
if not _table_columns(destination, table):
continue
orphan_count = int(
destination.execute(
f'SELECT COUNT(*) FROM "{table}" AS dependent '
"WHERE NOT EXISTS ("
"SELECT 1 FROM sessions "
"WHERE sessions.id = dependent.session_id)"
).fetchone()[0]
)
if orphan_count:
destination.execute(
f'DELETE FROM "{table}" '
"WHERE NOT EXISTS ("
"SELECT 1 FROM sessions "
f'WHERE sessions.id = "{table}".session_id)'
)
result[report_key] = orphan_count
destination.execute("COMMIT")
except BaseException:
destination.execute("ROLLBACK")
raise
# Only destructive/relinking actions belong in this total. The
# reconstruction counters describe data RETAINED, so summing them here
# would report saving the user's messages as if it were losing them.
result["total_removed_or_relinked"] = (
int(result["session_prompt_refs_cleared"])
+ int(result["sessions_parent_cleared"])
+ int(result["messages_removed"])
+ int(result["session_model_usage_removed"])
+ int(result["compression_locks_removed"])
+ int(result["telegram_dm_topic_bindings_removed"])
)
return result
def _verify_recovered_database(
output: Path,
*,
expected_counts: dict[str, Optional[int]],
copy_report: dict[str, dict[str, Any]],
allow_partial: bool = False,
orphan_cleanup: Optional[dict[str, Any]] = None,
) -> dict[str, Any]:
verification: dict[str, Any] = {
"errors": [],
"warnings": [],
"loss_detected": False,
}
open_error = _db_opens_cleanly(output)
verification["opens_cleanly"] = open_error is None
if open_error is not None:
verification["errors"].append(f"database health probe: {open_error}")
conn = sqlite3.connect(str(output), isolation_level=None)
try:
integrity_rows = [
str(row[0]) for row in conn.execute("PRAGMA integrity_check").fetchall()
]
verification["integrity_check"] = integrity_rows
if integrity_rows != ["ok"]:
verification["errors"].append(
"PRAGMA integrity_check did not return exactly 'ok'"
)
foreign_key_rows = [
list(row) for row in conn.execute("PRAGMA foreign_key_check").fetchall()
]
verification["foreign_key_check"] = foreign_key_rows
if foreign_key_rows:
verification["errors"].append("foreign key violations remain")
journal_row = conn.execute("PRAGMA journal_mode").fetchone()
verification["journal_mode"] = (
str(journal_row[0]).lower() if journal_row else None
)
schema_row = conn.execute(
"SELECT version FROM schema_version LIMIT 1"
).fetchone()
verification["schema_version"] = int(schema_row[0]) if schema_row else None
if verification["schema_version"] != SCHEMA_VERSION:
verification["errors"].append(
f"schema version is {verification['schema_version']}, "
f"expected {SCHEMA_VERSION}"
)
meta = {
str(row[0]): row[1]
for row in conn.execute(
"SELECT key, value FROM state_meta WHERE key LIKE 'fts_%'"
).fetchall()
}
verification["fts_meta"] = meta
if meta.get("fts_storage_version") != str(FTS_STORAGE_VERSION):
verification["errors"].append(
"fresh FTS storage version was not established"
)
pending_keys = sorted(
key
for key in (
"fts_optimize_available",
"fts_rebuild_high_water",
"fts_rebuild_progress",
"fts_cjk_stale",
"fts_cjk_rebuild_high_water",
"fts_cjk_rebuild_progress",
)
if key in meta
)
verification["pending_fts_keys"] = pending_keys
if pending_keys:
verification["errors"].append(
"derived FTS transition markers remain in the recovered database"
)
counts: dict[str, int] = {}
for table in _INVENTORY_TABLES:
columns = _table_columns(conn, table)
if columns:
counts[table] = int(
conn.execute(f'SELECT COUNT(*) FROM "{table}"').fetchone()[0]
)
verification["table_counts"] = counts
for table in ("sessions", "messages", *_AUXILIARY_TABLES):
expected = expected_counts.get(table)
if expected is not None and counts.get(table) != expected:
message = (
f"{table} count is {counts.get(table)}, expected {expected}"
)
if allow_partial:
verification["warnings"].append(message)
verification["loss_detected"] = True
else:
verification["errors"].append(message)
cleanup = orphan_cleanup or {}
rebuilt_sessions = int(cleanup.get("sessions_reconstructed") or 0)
retained_messages = int(cleanup.get("messages_retained") or 0)
removed_messages = int(cleanup.get("messages_removed") or 0)
# A wholly unreadable sessions b-tree is recoverable when every output
# parent was rebuilt from the surviving messages and none were dropped.
# This is still data loss, but it is not structural verification failure.
sessions_fully_reconstructed = bool(
rebuilt_sessions > 0
and counts.get("sessions") == rebuilt_sessions
and counts.get("messages") == retained_messages
and removed_messages == 0
)
for table, table_report in copy_report.items():
status = table_report.get("status")
if status not in {"failed", "partial"}:
continue
message = f"{table} copy status is {status}"
if allow_partial and (
status == "partial"
or table not in {"sessions", "messages"}
or (
table == "sessions"
and status == "failed"
and sessions_fully_reconstructed
)
):
verification["warnings"].append(message)
verification["loss_detected"] = True
else:
verification["errors"].append(message)
if orphan_cleanup:
orphan_count = int(
orphan_cleanup.get("total_removed_or_relinked") or 0
)
if orphan_count:
verification["warnings"].append(
f"{orphan_count} orphaned reference(s) were removed or relinked"
)
verification["loss_detected"] = True
rebuilt_sessions = int(
orphan_cleanup.get("sessions_reconstructed") or 0
)
if rebuilt_sessions:
retained = int(orphan_cleanup.get("messages_retained") or 0)
# Not a clean recovery: the conversation text survived but its
# session metadata did not, so these rows are placeholders.
verification["warnings"].append(
f"{rebuilt_sessions} session(s) could not be salvaged and "
f"were reconstructed as placeholders to retain "
f"{retained} message(s); their metadata (title, model, "
"timestamps, cost) is lost"
)
verification["loss_detected"] = True
fts_checks: dict[str, str] = {}
for table in ("messages_fts", "messages_fts_trigram", "messages_fts_cjk"):
if not _table_columns(conn, table):
continue
try:
conn.execute(
f'INSERT INTO "{table}" ("{table}") VALUES (\'integrity-check\')'
)
conn.execute(
f'SELECT 1 FROM "{table}" WHERE "{table}" MATCH \'""\' LIMIT 1'
).fetchone()
fts_checks[table] = "ok"
except sqlite3.DatabaseError as exc:
fts_checks[table] = str(exc)
verification["errors"].append(f"{table} integrity check failed: {exc}")
verification["fts_checks"] = fts_checks
except sqlite3.DatabaseError as exc:
verification["errors"].append(f"verification query failed: {exc}")
finally:
conn.close()
verification["healthy"] = not verification["errors"]
verification["complete"] = bool(
verification["healthy"] and not verification["loss_detected"]
)
return verification
def _finalize_derived_metadata(destination: sqlite3.Connection) -> dict[str, Any]:
"""Stamp only metadata that the newly created destination actually owns."""
fts_tables = {
str(row[0])
for row in destination.execute(
"SELECT name FROM sqlite_master "
"WHERE type='table' AND name IN ('messages_fts', 'messages_fts_trigram')"
).fetchall()
}
result: dict[str, Any] = {"fts_tables": sorted(fts_tables), "finalized": False}
if fts_tables != {"messages_fts", "messages_fts_trigram"}:
result["error"] = "fresh destination is missing required FTS tables"
return result
fts_keys = tuple(key for key in _GENERATED_META_KEYS if key.startswith("fts_"))
placeholders = ", ".join("?" for _ in fts_keys)
destination.execute("BEGIN IMMEDIATE")
try:
destination.execute(
f"DELETE FROM state_meta WHERE key IN ({placeholders})",
fts_keys,
)
destination.execute(
"INSERT INTO state_meta(key, value) VALUES (?, ?) "
"ON CONFLICT(key) DO UPDATE SET value = excluded.value",
("fts_storage_version", str(FTS_STORAGE_VERSION)),
)
destination.execute("COMMIT")
except BaseException:
destination.execute("ROLLBACK")
raise
result["finalized"] = True
return result
def _lost_and_found_plausibility_errors(
conn: sqlite3.Connection,
) -> list[str]:
"""Flag systematic timestamp mis-mapping in a salvaged database.
Structural checks (integrity, FK, FTS, row counts) pass on mis-mapped
salvage because every row still inserts. Only semantics give it away:
the physical column order of a source upgraded via ALTER TABLE differs
from the destination template's declared order, so positional cell
mapping lands counters/strings where ``started_at``/``timestamp``
belong — and the NOT NULL substitutes turn gaps into 0.0. When every
mapped row violates the epoch floor, the mapping was wrong.
Stub rows written by ``stub_missing_parent_sessions`` legitimately carry
``started_at = 0.0`` when no timestamped message survived, so they are
excluded from the denominator.
"""
from hermes_cli.session_lost_and_found import _EPOCH_LOW, STUB_TITLE_PREFIX
errors: list[str] = []
checks = (
("sessions", "started_at", f"WHERE COALESCE(title, '') NOT LIKE '{STUB_TITLE_PREFIX}%'"),
("messages", "timestamp", ""),
)
for table, column, mapped_filter in checks:
(total,) = conn.execute(f"SELECT COUNT(*) FROM {table} {mapped_filter}").fetchone()
if not total:
continue
(implausible,) = conn.execute(
f"SELECT COUNT(*) FROM {table} {mapped_filter} "
f"{'AND' if mapped_filter else 'WHERE'} ({column} IS NULL OR {column} < ?)",
(_EPOCH_LOW,),
).fetchone()
if implausible == total:
errors.append(
f"{table}.{column} is implausible in all {total} salvaged row(s) "
"(NULL or before 2001-09): the source's physical column order "
"did not match the destination template, so cells were mapped "
"onto the wrong columns"
)
return errors
def _recover_via_lost_and_found(
*,
source: Path,
snapshot_source: Path,
snapshot_dir: Path,
output: Path,
inspection: dict[str, Any],
disk_space: dict[str, Any],
missing_required: list[str],
) -> dict[str, Any]:
"""Best-effort page-level salvage when table schemas are unreadable.
Shells out to the sqlite3 CLI's ``.recover`` (a shell-only feature, not
part of Python's ``sqlite3`` module) to rebuild rows into a scratch
lost_and_found database, then heuristically maps them into a fresh
current-schema database. The result is explicitly labeled best-effort.
"""
from hermes_cli.session_lost_and_found import (
SQLITE3_CLI_GUIDANCE,
LostAndFoundError,
find_sqlite3_cli,
find_sqlite3_cli_refusal,
map_lost_and_found_rows,
rebuild_fts_indexes,
run_cli_lost_and_found_recover,
stub_missing_parent_sessions,
)
sqlite3_bin = find_sqlite3_cli()
if sqlite3_bin is None:
refusal = find_sqlite3_cli_refusal()
if refusal.get("reason") == "wal_reset_vulnerable":
raise SessionRecoverySourceError(
"Partial recovery requires a page-level salvage shell, but "
"the only sqlite3 CLI on PATH is not safe to use for it: it "
+ refusal["detail"]
+ ". The readable table schemas for: "
+ ", ".join(missing_required)
+ " are still required."
)
raise SessionRecoverySourceError(
"Partial recovery still requires readable table schemas for: "
+ ", ".join(missing_required)
+ ". " + SQLITE3_CLI_GUIDANCE
)
lf_path = snapshot_dir / "lost_and_found.db"
try:
cli_report = run_cli_lost_and_found_recover(
snapshot_source, lf_path, sqlite3_bin
)
except (LostAndFoundError, OSError) as exc:
raise SessionRecoverySourceError(
"Partial recovery could not read the table schemas for: "
+ ", ".join(missing_required)
+ f", and page-level .recover salvage failed: {exc}"
) from exc
destination_db = SessionDB(db_path=output)
destination_db.close()
lf_conn = sqlite3.connect(str(lf_path), isolation_level=None)
destination_conn = sqlite3.connect(
str(output), isolation_level=None, timeout=1.0
)
try:
destination_conn.execute("PRAGMA foreign_keys=OFF")
mapping = map_lost_and_found_rows(lf_conn, destination_conn)
stubbing = stub_missing_parent_sessions(destination_conn)
fts = rebuild_fts_indexes(destination_conn)
derived_metadata = _finalize_derived_metadata(destination_conn)
finally:
lf_conn.close()
destination_conn.close()
copy_report: dict[str, dict[str, Any]] = {
table: {
"mode": "lost_and_found_salvage",
"status": "partial",
"copied_rows": (
int(mapping["direct_table_rows"].get(table) or 0)
+ int(mapping["mapped"].get(table) or 0)
),
"error": "recovered via page-level lost_and_found salvage; "
"row completeness cannot be verified against the source",
}
for table in ("sessions", "messages", "session_model_usage")
}
verification = _verify_recovered_database(
output,
expected_counts={"sessions": None, "messages": None},
copy_report=copy_report,
allow_partial=True,
orphan_cleanup={
"sessions_reconstructed": stubbing["sessions_stubbed"],
"messages_retained": stubbing["messages_retained"],
"messages_removed": 0,
"total_removed_or_relinked": 0,
},
)
verification["loss_detected"] = True
verification["warnings"].append(
"BEST-EFFORT page-level salvage: the source table schemas were "
"unreadable, so rows were rebuilt from raw pages and mapped "
"heuristically. Review every count before trusting this output."
)
verification["complete"] = False
# Structural checks cannot see a positional mis-mapping (#101409):
# every row still inserts, so integrity/FK/FTS stay green. A
# systematic timestamp violation is the semantic tell — surface it
# so a mis-mapped salvage is never reported as verified.
plausibility_conn = sqlite3.connect(str(output), isolation_level=None)
try:
plausibility_errors = _lost_and_found_plausibility_errors(
plausibility_conn
)
finally:
plausibility_conn.close()
if plausibility_errors:
verification["errors"].extend(plausibility_errors)
verification["healthy"] = False
source_unchanged = (
_source_fingerprint(source) == inspection["source_fingerprint"]
)
if not source_unchanged:
verification["errors"].append(
"the source database bundle changed during recovery"
)
verification["healthy"] = False
return {
"operation": "recover",
"allow_partial": True,
"mode": "lost_and_found_salvage",
"best_effort": True,
"source": str(source),
"output": str(output),
"source_bundle": inspection["source_bundle"],
"source_fingerprint": inspection["source_fingerprint"],
"source_unchanged": source_unchanged,
"disk_space": disk_space,
"inspection": {
"journal_mode": inspection.get("journal_mode"),
"tables": inspection["tables"],
"errors": inspection["errors"],
"warnings": inspection["warnings"],
},
"unreadable_schemas": missing_required,
"sqlite3_cli": cli_report,
"lost_and_found": mapping,
"session_stubs": stubbing,
"fts_rebuild": fts,
"copy": copy_report,
"orphan_cleanup": {
"sessions_reconstructed": stubbing["sessions_stubbed"],
"messages_retained": stubbing["messages_retained"],
"messages_removed": 0,
"total_removed_or_relinked": 0,
},
"derived_metadata": derived_metadata,
"verification": verification,
"complete": False,
"partial": True,
"verified": bool(verification.get("healthy") and source_unchanged),
"installed": False,
}
def recover_session_database(
source_path: Path,
output_path: Path,
*,
work_dir: Optional[Path] = None,
chunk_size: int = 1_000,
progress_cb: Optional[ProgressCallback] = None,
allow_partial: bool = False,
) -> dict[str, Any]:
"""Recover canonical rows into a separate current-schema database.
The source path and its sidecars are copied before SQLite opens anything.
``output_path`` must not exist and is never swapped into place.
"""
if chunk_size <= 0:
raise SessionRecoverySafetyError("chunk_size must be greater than zero")
source, output, work_root = _validate_paths(
source_path,
output_path=output_path,
work_dir=work_dir,
)
assert output is not None
disk_space = _disk_space_preflight(source, work_root, output.parent)
temp_dir, snapshot_source, inspection = _snapshot_and_inspect(source, work_root)
try:
if not inspection.get("recoverable") and not allow_partial:
reasons = "; ".join(inspection.get("errors") or ["unknown source error"])
raise SessionRecoverySourceError(
f"Required canonical tables are not readable: {reasons}. "
"Re-run with --allow-partial to salvage every readable row "
"into a new database (the source is never modified)."
)
if allow_partial:
missing_required = [
table
for table in ("sessions", "messages")
if not inspection["tables"][table].get("available")
]
if missing_required:
# SQL-level salvage is impossible without readable table
# schemas. Fall back to page-level lost_and_found salvage via
# the sqlite3 CLI's .recover (a shell-only feature).
return _recover_via_lost_and_found(
source=source,
snapshot_source=snapshot_source,
snapshot_dir=Path(temp_dir.name),
output=output,
inspection=inspection,
disk_space=disk_space,
missing_required=missing_required,
)
source_conn = sqlite3.connect(
str(snapshot_source),
isolation_level=None,
timeout=1.0,
)
source_conn.execute("PRAGMA writable_schema=ON")
destination_db: Optional[SessionDB] = None
destination_conn: Optional[sqlite3.Connection] = None
try:
has_topic_tables = any(
inspection["tables"][table].get("available") for table in _TOPIC_TABLES
)
destination_db = SessionDB(db_path=output)
if has_topic_tables:
destination_db.apply_telegram_topic_migration()
destination_db.close()
destination_db = None
destination_conn = sqlite3.connect(
str(output),
isolation_level=None,
timeout=1.0,
)
destination_conn.execute("PRAGMA foreign_keys=OFF")
copy_report: dict[str, dict[str, Any]] = {}
for table in _CANONICAL_TABLES:
table_inspection = inspection["tables"][table]
copy_function = (
_copy_table_salvage if allow_partial else _copy_table
)
copy_report[table] = copy_function(
source_conn,
destination_conn,
table,
chunk_size=chunk_size,
progress_cb=progress_cb,
source_rows=table_inspection.get("rows"),
)
state_meta_inspection = inspection["tables"]["state_meta"]
if state_meta_inspection.get("available"):
state_meta_copy_function = (
_copy_state_meta_salvage
if allow_partial
else _copy_state_meta
)
copy_report["state_meta"] = state_meta_copy_function(
source_conn,
destination_conn,
chunk_size=chunk_size,
progress_cb=progress_cb,
source_rows=state_meta_inspection.get("rows"),
)
else:
copy_report["state_meta"] = {"status": "missing", "copied_rows": 0}
for table in _TOPIC_TABLES:
table_inspection = inspection["tables"][table]
if not table_inspection.get("available"):
copy_report[table] = {
"status": "missing",
"copied_rows": 0,
}
continue
copy_function = (
_copy_table_salvage if allow_partial else _copy_table
)
copy_report[table] = copy_function(
source_conn,
destination_conn,
table,
chunk_size=chunk_size,
progress_cb=progress_cb,
source_rows=table_inspection.get("rows"),
)
for table in _AUXILIARY_TABLES:
table_inspection = inspection["tables"][table]
if not table_inspection.get("available"):
copy_report[table] = {
"status": "missing",
"copied_rows": 0,
}
continue
_ensure_auxiliary_destination_schema(destination_conn, table)
copy_function = (
_copy_table_salvage if allow_partial else _copy_table
)
copy_report[table] = copy_function(
source_conn,
destination_conn,
table,
chunk_size=chunk_size,
progress_cb=progress_cb,
source_rows=table_inspection.get("rows"),
)
orphan_cleanup = (
_cleanup_partial_orphans(destination_conn)
if allow_partial
else None
)
derived_metadata = _finalize_derived_metadata(destination_conn)
finally:
source_conn.close()
if destination_conn is not None:
destination_conn.close()
if destination_db is not None:
destination_db.close()
verification = _verify_recovered_database(
output,
expected_counts={
**{
table: inspection["tables"][table].get("rows")
for table in _CANONICAL_TABLES
},
**{
table: inspection["tables"][table].get("rows")
for table in _AUXILIARY_TABLES
if inspection["tables"].get(table, {}).get("available")
},
},
copy_report=copy_report,
allow_partial=allow_partial,
orphan_cleanup=orphan_cleanup,
)
source_unchanged = (
_source_fingerprint(source) == inspection["source_fingerprint"]
)
if not source_unchanged:
verification["errors"].append(
"the source database bundle changed during recovery"
)
verification["complete"] = False
return {
"operation": "recover",
"allow_partial": allow_partial,
"source": str(source),
"output": str(output),
"source_bundle": inspection["source_bundle"],
"source_fingerprint": inspection["source_fingerprint"],
"source_unchanged": source_unchanged,
"disk_space": disk_space,
"inspection": {
"journal_mode": inspection.get("journal_mode"),
"tables": inspection["tables"],
"errors": inspection["errors"],
"warnings": inspection["warnings"],
},
"copy": copy_report,
"orphan_cleanup": orphan_cleanup,
"derived_metadata": derived_metadata,
"verification": verification,
"complete": bool(verification.get("complete") and source_unchanged),
"partial": bool(verification.get("loss_detected")),
"verified": bool(verification.get("healthy") and source_unchanged),
"installed": False,
}
finally:
temp_dir.cleanup()
def write_recovery_report(path: Path, report: dict[str, Any]) -> Path:
"""Write a JSON report without overwriting an existing file."""
destination = _resolved_output_path(path)
with destination.open("x", encoding="utf-8") as handle:
json.dump(report, handle, indent=2, sort_keys=True)
handle.write("\n")
return destination