#!/usr/bin/env python3 """ SQLite State Store for Hermes Agent. Provides persistent session storage with FTS5 full-text search, replacing the per-session JSONL file approach. Stores session metadata, full message history, and model configuration for CLI and gateway sessions. Key design decisions: - WAL mode for concurrent readers + one writer (gateway multi-platform) - FTS5 virtual table for fast text search across all session messages - Compression-triggered session splitting via parent_session_id chains - Batch runner and RL trajectories are NOT stored here (separate systems) - Session source tagging ('cli', 'telegram', 'discord', etc.) for filtering """ import json import os import re import sqlite3 import threading import time from pathlib import Path from typing import Dict, Any, List, Optional DEFAULT_DB_PATH = Path(os.getenv("HERMES_HOME", Path.home() / ".hermes")) / "state.db" SCHEMA_VERSION = 5 SCHEMA_SQL = """ CREATE TABLE IF NOT EXISTS schema_version ( version INTEGER NOT NULL ); CREATE TABLE IF NOT EXISTS sessions ( id TEXT PRIMARY KEY, source TEXT NOT NULL, user_id TEXT, model TEXT, model_config TEXT, system_prompt TEXT, parent_session_id TEXT, started_at REAL NOT NULL, ended_at REAL, end_reason TEXT, message_count INTEGER DEFAULT 0, tool_call_count INTEGER DEFAULT 0, input_tokens INTEGER DEFAULT 0, output_tokens INTEGER DEFAULT 0, cache_read_tokens INTEGER DEFAULT 0, cache_write_tokens INTEGER DEFAULT 0, reasoning_tokens INTEGER DEFAULT 0, billing_provider TEXT, billing_base_url TEXT, billing_mode TEXT, estimated_cost_usd REAL, actual_cost_usd REAL, cost_status TEXT, cost_source TEXT, pricing_version TEXT, title TEXT, FOREIGN KEY (parent_session_id) REFERENCES sessions(id) ); CREATE TABLE IF NOT EXISTS messages ( id INTEGER PRIMARY KEY AUTOINCREMENT, session_id TEXT NOT NULL REFERENCES sessions(id), role TEXT NOT NULL, content TEXT, tool_call_id TEXT, tool_calls TEXT, tool_name TEXT, timestamp REAL NOT NULL, token_count INTEGER, finish_reason TEXT ); CREATE INDEX IF NOT EXISTS idx_sessions_source ON sessions(source); CREATE INDEX IF NOT EXISTS idx_sessions_parent ON sessions(parent_session_id); CREATE INDEX IF NOT EXISTS idx_sessions_started ON sessions(started_at DESC); CREATE INDEX IF NOT EXISTS idx_messages_session ON messages(session_id, timestamp); """ FTS_SQL = """ CREATE VIRTUAL TABLE IF NOT EXISTS messages_fts USING fts5( content, content=messages, content_rowid=id ); CREATE TRIGGER IF NOT EXISTS messages_fts_insert AFTER INSERT ON messages BEGIN INSERT INTO messages_fts(rowid, content) VALUES (new.id, new.content); END; CREATE TRIGGER IF NOT EXISTS messages_fts_delete AFTER DELETE ON messages BEGIN INSERT INTO messages_fts(messages_fts, rowid, content) VALUES('delete', old.id, old.content); END; CREATE TRIGGER IF NOT EXISTS messages_fts_update AFTER UPDATE ON messages BEGIN INSERT INTO messages_fts(messages_fts, rowid, content) VALUES('delete', old.id, old.content); INSERT INTO messages_fts(rowid, content) VALUES (new.id, new.content); END; """ class SessionDB: """ SQLite-backed session storage with FTS5 search. Thread-safe for the common gateway pattern (multiple reader threads, single writer via WAL mode). Each method opens its own cursor. """ def __init__(self, db_path: Path = None): self.db_path = db_path or DEFAULT_DB_PATH self.db_path.parent.mkdir(parents=True, exist_ok=True) self._lock = threading.Lock() self._conn = sqlite3.connect( str(self.db_path), check_same_thread=False, timeout=10.0, ) self._conn.row_factory = sqlite3.Row self._conn.execute("PRAGMA journal_mode=WAL") self._conn.execute("PRAGMA foreign_keys=ON") self._init_schema() def _init_schema(self): """Create tables and FTS if they don't exist, run migrations.""" cursor = self._conn.cursor() cursor.executescript(SCHEMA_SQL) # Check schema version and run migrations cursor.execute("SELECT version FROM schema_version LIMIT 1") row = cursor.fetchone() if row is None: cursor.execute("INSERT INTO schema_version (version) VALUES (?)", (SCHEMA_VERSION,)) else: current_version = row["version"] if isinstance(row, sqlite3.Row) else row[0] if current_version < 2: # v2: add finish_reason column to messages try: cursor.execute("ALTER TABLE messages ADD COLUMN finish_reason TEXT") except sqlite3.OperationalError: pass # Column already exists cursor.execute("UPDATE schema_version SET version = 2") if current_version < 3: # v3: add title column to sessions try: cursor.execute("ALTER TABLE sessions ADD COLUMN title TEXT") except sqlite3.OperationalError: pass # Column already exists cursor.execute("UPDATE schema_version SET version = 3") if current_version < 4: # v4: add unique index on title (NULLs allowed, only non-NULL must be unique) try: cursor.execute( "CREATE UNIQUE INDEX IF NOT EXISTS idx_sessions_title_unique " "ON sessions(title) WHERE title IS NOT NULL" ) except sqlite3.OperationalError: pass # Index already exists cursor.execute("UPDATE schema_version SET version = 4") if current_version < 5: new_columns = [ ("cache_read_tokens", "INTEGER DEFAULT 0"), ("cache_write_tokens", "INTEGER DEFAULT 0"), ("reasoning_tokens", "INTEGER DEFAULT 0"), ("billing_provider", "TEXT"), ("billing_base_url", "TEXT"), ("billing_mode", "TEXT"), ("estimated_cost_usd", "REAL"), ("actual_cost_usd", "REAL"), ("cost_status", "TEXT"), ("cost_source", "TEXT"), ("pricing_version", "TEXT"), ] for name, column_type in new_columns: try: cursor.execute(f"ALTER TABLE sessions ADD COLUMN {name} {column_type}") except sqlite3.OperationalError: pass cursor.execute("UPDATE schema_version SET version = 5") # Unique title index — always ensure it exists (safe to run after migrations # since the title column is guaranteed to exist at this point) try: cursor.execute( "CREATE UNIQUE INDEX IF NOT EXISTS idx_sessions_title_unique " "ON sessions(title) WHERE title IS NOT NULL" ) except sqlite3.OperationalError: pass # Index already exists # FTS5 setup (separate because CREATE VIRTUAL TABLE can't be in executescript with IF NOT EXISTS reliably) try: cursor.execute("SELECT * FROM messages_fts LIMIT 0") except sqlite3.OperationalError: cursor.executescript(FTS_SQL) self._conn.commit() def close(self): """Close the database connection.""" with self._lock: if self._conn: self._conn.close() self._conn = None # ========================================================================= # Session lifecycle # ========================================================================= def create_session( self, session_id: str, source: str, model: str = None, model_config: Dict[str, Any] = None, system_prompt: str = None, user_id: str = None, parent_session_id: str = None, ) -> str: """Create a new session record. Returns the session_id.""" with self._lock: self._conn.execute( """INSERT INTO sessions (id, source, user_id, model, model_config, system_prompt, parent_session_id, started_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)""", ( session_id, source, user_id, model, json.dumps(model_config) if model_config else None, system_prompt, parent_session_id, time.time(), ), ) self._conn.commit() return session_id def end_session(self, session_id: str, end_reason: str) -> None: """Mark a session as ended.""" with self._lock: self._conn.execute( "UPDATE sessions SET ended_at = ?, end_reason = ? WHERE id = ?", (time.time(), end_reason, session_id), ) self._conn.commit() def update_system_prompt(self, session_id: str, system_prompt: str) -> None: """Store the full assembled system prompt snapshot.""" with self._lock: self._conn.execute( "UPDATE sessions SET system_prompt = ? WHERE id = ?", (system_prompt, session_id), ) self._conn.commit() def update_token_counts( self, session_id: str, input_tokens: int = 0, output_tokens: int = 0, model: str = None, cache_read_tokens: int = 0, cache_write_tokens: int = 0, reasoning_tokens: int = 0, estimated_cost_usd: Optional[float] = None, actual_cost_usd: Optional[float] = None, cost_status: Optional[str] = None, cost_source: Optional[str] = None, pricing_version: Optional[str] = None, billing_provider: Optional[str] = None, billing_base_url: Optional[str] = None, billing_mode: Optional[str] = None, ) -> None: """Increment token counters and backfill model if not already set.""" with self._lock: self._conn.execute( """UPDATE sessions SET input_tokens = input_tokens + ?, output_tokens = output_tokens + ?, cache_read_tokens = cache_read_tokens + ?, cache_write_tokens = cache_write_tokens + ?, reasoning_tokens = reasoning_tokens + ?, estimated_cost_usd = COALESCE(estimated_cost_usd, 0) + COALESCE(?, 0), actual_cost_usd = CASE WHEN ? IS NULL THEN actual_cost_usd ELSE COALESCE(actual_cost_usd, 0) + ? END, cost_status = COALESCE(?, cost_status), cost_source = COALESCE(?, cost_source), pricing_version = COALESCE(?, pricing_version), billing_provider = COALESCE(billing_provider, ?), billing_base_url = COALESCE(billing_base_url, ?), billing_mode = COALESCE(billing_mode, ?), model = COALESCE(model, ?) WHERE id = ?""", ( input_tokens, output_tokens, cache_read_tokens, cache_write_tokens, reasoning_tokens, estimated_cost_usd, actual_cost_usd, actual_cost_usd, cost_status, cost_source, pricing_version, billing_provider, billing_base_url, billing_mode, model, session_id, ), ) self._conn.commit() def get_session(self, session_id: str) -> Optional[Dict[str, Any]]: """Get a session by ID.""" with self._lock: cursor = self._conn.execute( "SELECT * FROM sessions WHERE id = ?", (session_id,) ) row = cursor.fetchone() return dict(row) if row else None def resolve_session_id(self, session_id_or_prefix: str) -> Optional[str]: """Resolve an exact or uniquely prefixed session ID to the full ID. Returns the exact ID when it exists. Otherwise treats the input as a prefix and returns the single matching session ID if the prefix is unambiguous. Returns None for no matches or ambiguous prefixes. """ exact = self.get_session(session_id_or_prefix) if exact: return exact["id"] escaped = ( session_id_or_prefix .replace("\\", "\\\\") .replace("%", "\\%") .replace("_", "\\_") ) cursor = self._conn.execute( "SELECT id FROM sessions WHERE id LIKE ? ESCAPE '\\' ORDER BY started_at DESC LIMIT 2", (f"{escaped}%",), ) matches = [row["id"] for row in cursor.fetchall()] if len(matches) == 1: return matches[0] return None # Maximum length for session titles MAX_TITLE_LENGTH = 100 @staticmethod def sanitize_title(title: Optional[str]) -> Optional[str]: """Validate and sanitize a session title. - Strips leading/trailing whitespace - Removes ASCII control characters (0x00-0x1F, 0x7F) and problematic Unicode control chars (zero-width, RTL/LTR overrides, etc.) - Collapses internal whitespace runs to single spaces - Normalizes empty/whitespace-only strings to None - Enforces MAX_TITLE_LENGTH Returns the cleaned title string or None. Raises ValueError if the title exceeds MAX_TITLE_LENGTH after cleaning. """ if not title: return None # Remove ASCII control characters (0x00-0x1F, 0x7F) but keep # whitespace chars (\t=0x09, \n=0x0A, \r=0x0D) so they can be # normalized to spaces by the whitespace collapsing step below cleaned = re.sub(r'[\x00-\x08\x0b\x0c\x0e-\x1f\x7f]', '', title) # Remove problematic Unicode control characters: # - Zero-width chars (U+200B-U+200F, U+FEFF) # - Directional overrides (U+202A-U+202E, U+2066-U+2069) # - Object replacement (U+FFFC), interlinear annotation (U+FFF9-U+FFFB) cleaned = re.sub( r'[\u200b-\u200f\u2028-\u202e\u2060-\u2069\ufeff\ufffc\ufff9-\ufffb]', '', cleaned, ) # Collapse internal whitespace runs and strip cleaned = re.sub(r'\s+', ' ', cleaned).strip() if not cleaned: return None if len(cleaned) > SessionDB.MAX_TITLE_LENGTH: raise ValueError( f"Title too long ({len(cleaned)} chars, max {SessionDB.MAX_TITLE_LENGTH})" ) return cleaned def set_session_title(self, session_id: str, title: str) -> bool: """Set or update a session's title. Returns True if session was found and title was set. Raises ValueError if title is already in use by another session, or if the title fails validation (too long, invalid characters). Empty/whitespace-only strings are normalized to None (clearing the title). """ title = self.sanitize_title(title) with self._lock: if title: # Check uniqueness (allow the same session to keep its own title) cursor = self._conn.execute( "SELECT id FROM sessions WHERE title = ? AND id != ?", (title, session_id), ) conflict = cursor.fetchone() if conflict: raise ValueError( f"Title '{title}' is already in use by session {conflict['id']}" ) cursor = self._conn.execute( "UPDATE sessions SET title = ? WHERE id = ?", (title, session_id), ) self._conn.commit() rowcount = cursor.rowcount return rowcount > 0 def get_session_title(self, session_id: str) -> Optional[str]: """Get the title for a session, or None.""" with self._lock: cursor = self._conn.execute( "SELECT title FROM sessions WHERE id = ?", (session_id,) ) row = cursor.fetchone() return row["title"] if row else None def get_session_by_title(self, title: str) -> Optional[Dict[str, Any]]: """Look up a session by exact title. Returns session dict or None.""" with self._lock: cursor = self._conn.execute( "SELECT * FROM sessions WHERE title = ?", (title,) ) row = cursor.fetchone() return dict(row) if row else None def resolve_session_by_title(self, title: str) -> Optional[str]: """Resolve a title to a session ID, preferring the latest in a lineage. If the exact title exists, returns that session's ID. If not, searches for "title #N" variants and returns the latest one. If the exact title exists AND numbered variants exist, returns the latest numbered variant (the most recent continuation). """ # First try exact match exact = self.get_session_by_title(title) # Also search for numbered variants: "title #2", "title #3", etc. # Escape SQL LIKE wildcards (%, _) in the title to prevent false matches escaped = title.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_") with self._lock: cursor = self._conn.execute( "SELECT id, title, started_at FROM sessions " "WHERE title LIKE ? ESCAPE '\\' ORDER BY started_at DESC", (f"{escaped} #%",), ) numbered = cursor.fetchall() if numbered: # Return the most recent numbered variant return numbered[0]["id"] elif exact: return exact["id"] return None def get_next_title_in_lineage(self, base_title: str) -> str: """Generate the next title in a lineage (e.g., "my session" → "my session #2"). Strips any existing " #N" suffix to find the base name, then finds the highest existing number and increments. """ # Strip existing #N suffix to find the true base match = re.match(r'^(.*?) #(\d+)$', base_title) if match: base = match.group(1) else: base = base_title # Find all existing numbered variants # Escape SQL LIKE wildcards (%, _) in the base to prevent false matches escaped = base.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_") with self._lock: cursor = self._conn.execute( "SELECT title FROM sessions WHERE title = ? OR title LIKE ? ESCAPE '\\'", (base, f"{escaped} #%"), ) existing = [row["title"] for row in cursor.fetchall()] if not existing: return base # No conflict, use the base name as-is # Find the highest number max_num = 1 # The unnumbered original counts as #1 for t in existing: m = re.match(r'^.* #(\d+)$', t) if m: max_num = max(max_num, int(m.group(1))) return f"{base} #{max_num + 1}" def list_sessions_rich( self, source: str = None, limit: int = 20, offset: int = 0, ) -> List[Dict[str, Any]]: """List sessions with preview (first user message) and last active timestamp. Returns dicts with keys: id, source, model, title, started_at, ended_at, message_count, preview (first 60 chars of first user message), last_active (timestamp of last message). Uses a single query with correlated subqueries instead of N+2 queries. """ source_clause = "WHERE s.source = ?" if source else "" query = f""" SELECT s.*, COALESCE( (SELECT SUBSTR(REPLACE(REPLACE(m.content, X'0A', ' '), X'0D', ' '), 1, 63) FROM messages m WHERE m.session_id = s.id AND m.role = 'user' AND m.content IS NOT NULL ORDER BY m.timestamp, m.id LIMIT 1), '' ) AS _preview_raw, COALESCE( (SELECT MAX(m2.timestamp) FROM messages m2 WHERE m2.session_id = s.id), s.started_at ) AS last_active FROM sessions s {source_clause} ORDER BY s.started_at DESC LIMIT ? OFFSET ? """ params = (source, limit, offset) if source else (limit, offset) with self._lock: cursor = self._conn.execute(query, params) rows = cursor.fetchall() sessions = [] for row in rows: s = dict(row) # Build the preview from the raw substring raw = s.pop("_preview_raw", "").strip() if raw: text = raw[:60] s["preview"] = text + ("..." if len(raw) > 60 else "") else: s["preview"] = "" sessions.append(s) return sessions # ========================================================================= # Message storage # ========================================================================= def append_message( self, session_id: str, role: str, content: str = None, tool_name: str = None, tool_calls: Any = None, tool_call_id: str = None, token_count: int = None, finish_reason: str = None, ) -> int: """ Append a message to a session. Returns the message row ID. Also increments the session's message_count (and tool_call_count if role is 'tool' or tool_calls is present). """ with self._lock: cursor = self._conn.execute( """INSERT INTO messages (session_id, role, content, tool_call_id, tool_calls, tool_name, timestamp, token_count, finish_reason) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)""", ( session_id, role, content, tool_call_id, json.dumps(tool_calls) if tool_calls else None, tool_name, time.time(), token_count, finish_reason, ), ) msg_id = cursor.lastrowid # Update counters # Count actual tool calls from the tool_calls list (not from tool responses). # A single assistant message can contain multiple parallel tool calls. num_tool_calls = 0 if tool_calls is not None: num_tool_calls = len(tool_calls) if isinstance(tool_calls, list) else 1 if num_tool_calls > 0: self._conn.execute( """UPDATE sessions SET message_count = message_count + 1, tool_call_count = tool_call_count + ? WHERE id = ?""", (num_tool_calls, session_id), ) else: self._conn.execute( "UPDATE sessions SET message_count = message_count + 1 WHERE id = ?", (session_id,), ) self._conn.commit() return msg_id def get_messages(self, session_id: str) -> List[Dict[str, Any]]: """Load all messages for a session, ordered by timestamp.""" with self._lock: cursor = self._conn.execute( "SELECT * FROM messages WHERE session_id = ? ORDER BY timestamp, id", (session_id,), ) rows = cursor.fetchall() result = [] for row in rows: msg = dict(row) if msg.get("tool_calls"): try: msg["tool_calls"] = json.loads(msg["tool_calls"]) except (json.JSONDecodeError, TypeError): pass result.append(msg) return result def get_messages_as_conversation(self, session_id: str) -> List[Dict[str, Any]]: """ Load messages in the OpenAI conversation format (role + content dicts). Used by the gateway to restore conversation history. """ with self._lock: cursor = self._conn.execute( "SELECT role, content, tool_call_id, tool_calls, tool_name " "FROM messages WHERE session_id = ? ORDER BY timestamp, id", (session_id,), ) rows = cursor.fetchall() messages = [] for row in rows: msg = {"role": row["role"], "content": row["content"]} if row["tool_call_id"]: msg["tool_call_id"] = row["tool_call_id"] if row["tool_name"]: msg["tool_name"] = row["tool_name"] if row["tool_calls"]: try: msg["tool_calls"] = json.loads(row["tool_calls"]) except (json.JSONDecodeError, TypeError): pass messages.append(msg) return messages # ========================================================================= # Search # ========================================================================= @staticmethod def _sanitize_fts5_query(query: str) -> str: """Sanitize user input for safe use in FTS5 MATCH queries. FTS5 has its own query syntax where characters like ``"``, ``(``, ``)``, ``+``, ``*``, ``{``, ``}`` and bare boolean operators (``AND``, ``OR``, ``NOT``) have special meaning. Passing raw user input directly to MATCH can cause ``sqlite3.OperationalError``. Strategy: strip characters that are only meaningful as FTS5 operators and would otherwise cause syntax errors. This preserves normal keyword search while preventing crashes on inputs like ``C++``, ``"unterminated``, or ``hello AND``. """ # Remove FTS5-special characters that are not useful in keyword search sanitized = re.sub(r'[+{}()"^]', " ", query) # Collapse repeated * (e.g. "***") into a single one, and remove # leading * (prefix-only matching requires at least one char before *) sanitized = re.sub(r"\*+", "*", sanitized) sanitized = re.sub(r"(^|\s)\*", r"\1", sanitized) # Remove dangling boolean operators at start/end that would cause # syntax errors (e.g. "hello AND" or "OR world") sanitized = re.sub(r"(?i)^(AND|OR|NOT)\b\s*", "", sanitized.strip()) sanitized = re.sub(r"(?i)\s+(AND|OR|NOT)\s*$", "", sanitized.strip()) return sanitized.strip() def search_messages( self, query: str, source_filter: List[str] = None, role_filter: List[str] = None, limit: int = 20, offset: int = 0, ) -> List[Dict[str, Any]]: """ Full-text search across session messages using FTS5. Supports FTS5 query syntax: - Simple keywords: "docker deployment" - Phrases: '"exact phrase"' - Boolean: "docker OR kubernetes", "python NOT java" - Prefix: "deploy*" Returns matching messages with session metadata, content snippet, and surrounding context (1 message before and after the match). """ if not query or not query.strip(): return [] query = self._sanitize_fts5_query(query) if not query: return [] if source_filter is None: source_filter = ["cli", "telegram", "discord", "whatsapp", "slack"] # Build WHERE clauses dynamically where_clauses = ["messages_fts MATCH ?"] params: list = [query] source_placeholders = ",".join("?" for _ in source_filter) where_clauses.append(f"s.source IN ({source_placeholders})") params.extend(source_filter) if role_filter: role_placeholders = ",".join("?" for _ in role_filter) where_clauses.append(f"m.role IN ({role_placeholders})") params.extend(role_filter) where_sql = " AND ".join(where_clauses) params.extend([limit, offset]) sql = f""" SELECT m.id, m.session_id, m.role, snippet(messages_fts, 0, '>>>', '<<<', '...', 40) AS snippet, m.content, m.timestamp, m.tool_name, s.source, s.model, s.started_at AS session_started FROM messages_fts JOIN messages m ON m.id = messages_fts.rowid JOIN sessions s ON s.id = m.session_id WHERE {where_sql} ORDER BY rank LIMIT ? OFFSET ? """ with self._lock: try: cursor = self._conn.execute(sql, params) except sqlite3.OperationalError: # FTS5 query syntax error despite sanitization — return empty return [] matches = [dict(row) for row in cursor.fetchall()] # Add surrounding context (1 message before + after each match) for match in matches: try: ctx_cursor = self._conn.execute( """SELECT role, content FROM messages WHERE session_id = ? AND id >= ? - 1 AND id <= ? + 1 ORDER BY id""", (match["session_id"], match["id"], match["id"]), ) context_msgs = [ {"role": r["role"], "content": (r["content"] or "")[:200]} for r in ctx_cursor.fetchall() ] match["context"] = context_msgs except Exception: match["context"] = [] # Remove full content from result (snippet is enough, saves tokens) for match in matches: match.pop("content", None) return matches def search_sessions( self, source: str = None, limit: int = 20, offset: int = 0, ) -> List[Dict[str, Any]]: """List sessions, optionally filtered by source.""" with self._lock: if source: cursor = self._conn.execute( "SELECT * FROM sessions WHERE source = ? ORDER BY started_at DESC LIMIT ? OFFSET ?", (source, limit, offset), ) else: cursor = self._conn.execute( "SELECT * FROM sessions ORDER BY started_at DESC LIMIT ? OFFSET ?", (limit, offset), ) return [dict(row) for row in cursor.fetchall()] # ========================================================================= # Utility # ========================================================================= def session_count(self, source: str = None) -> int: """Count sessions, optionally filtered by source.""" if source: cursor = self._conn.execute( "SELECT COUNT(*) FROM sessions WHERE source = ?", (source,) ) else: cursor = self._conn.execute("SELECT COUNT(*) FROM sessions") return cursor.fetchone()[0] def message_count(self, session_id: str = None) -> int: """Count messages, optionally for a specific session.""" if session_id: cursor = self._conn.execute( "SELECT COUNT(*) FROM messages WHERE session_id = ?", (session_id,) ) else: cursor = self._conn.execute("SELECT COUNT(*) FROM messages") return cursor.fetchone()[0] # ========================================================================= # Export and cleanup # ========================================================================= def export_session(self, session_id: str) -> Optional[Dict[str, Any]]: """Export a single session with all its messages as a dict.""" session = self.get_session(session_id) if not session: return None messages = self.get_messages(session_id) return {**session, "messages": messages} def export_all(self, source: str = None) -> List[Dict[str, Any]]: """ Export all sessions (with messages) as a list of dicts. Suitable for writing to a JSONL file for backup/analysis. """ sessions = self.search_sessions(source=source, limit=100000) results = [] for session in sessions: messages = self.get_messages(session["id"]) results.append({**session, "messages": messages}) return results def clear_messages(self, session_id: str) -> None: """Delete all messages for a session and reset its counters.""" with self._lock: self._conn.execute( "DELETE FROM messages WHERE session_id = ?", (session_id,) ) self._conn.execute( "UPDATE sessions SET message_count = 0, tool_call_count = 0 WHERE id = ?", (session_id,), ) self._conn.commit() def delete_session(self, session_id: str) -> bool: """Delete a session and all its messages. Returns True if found.""" with self._lock: cursor = self._conn.execute( "SELECT COUNT(*) FROM sessions WHERE id = ?", (session_id,) ) if cursor.fetchone()[0] == 0: return False self._conn.execute("DELETE FROM messages WHERE session_id = ?", (session_id,)) self._conn.execute("DELETE FROM sessions WHERE id = ?", (session_id,)) self._conn.commit() return True def prune_sessions(self, older_than_days: int = 90, source: str = None) -> int: """ Delete sessions older than N days. Returns count of deleted sessions. Only prunes ended sessions (not active ones). """ import time as _time cutoff = _time.time() - (older_than_days * 86400) with self._lock: if source: cursor = self._conn.execute( """SELECT id FROM sessions WHERE started_at < ? AND ended_at IS NOT NULL AND source = ?""", (cutoff, source), ) else: cursor = self._conn.execute( "SELECT id FROM sessions WHERE started_at < ? AND ended_at IS NOT NULL", (cutoff,), ) session_ids = [row["id"] for row in cursor.fetchall()] for sid in session_ids: self._conn.execute("DELETE FROM messages WHERE session_id = ?", (sid,)) self._conn.execute("DELETE FROM sessions WHERE id = ?", (sid,)) self._conn.commit() return len(session_ids)