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"""
Database Migration System
Handles schema versioning and migrations for SQLite database
"""
import sqlite3
import logging
from typing import List, Callable, Tuple
from datetime import datetime
from pathlib import Path
import traceback
logger = logging.getLogger(__name__)
class Migration:
"""Represents a single database migration"""
def __init__(
self,
version: int,
description: str,
up_sql: str,
down_sql: str = ""
):
"""
Initialize migration
Args:
version: Migration version number (sequential)
description: Human-readable description
up_sql: SQL to apply migration
down_sql: SQL to rollback migration
"""
self.version = version
self.description = description
self.up_sql = up_sql
self.down_sql = down_sql
class MigrationManager:
"""
Manages database schema migrations
Tracks applied migrations and handles upgrades/downgrades
"""
def __init__(self, db_path: str):
"""
Initialize migration manager
Args:
db_path: Path to SQLite database file
"""
self.db_path = db_path
self.migrations: List[Migration] = []
self._init_migrations_table()
self._register_migrations()
def _init_migrations_table(self):
"""Create migrations tracking table if not exists"""
try:
conn = sqlite3.connect(self.db_path)
cursor = conn.cursor()
cursor.execute("""
CREATE TABLE IF NOT EXISTS schema_migrations (
version INTEGER PRIMARY KEY,
description TEXT NOT NULL,
applied_at TIMESTAMP NOT NULL,
execution_time_ms INTEGER
)
""")
conn.commit()
conn.close()
logger.info("Migrations table initialized")
except Exception as e:
logger.error(f"Failed to initialize migrations table: {e}")
raise
def _register_migrations(self):
"""Register all migrations in order"""
# Migration 1: Add whale tracking table
self.migrations.append(Migration(
version=1,
description="Add whale tracking table",
up_sql="""
CREATE TABLE IF NOT EXISTS whale_transactions (
id INTEGER PRIMARY KEY AUTOINCREMENT,
transaction_hash TEXT UNIQUE NOT NULL,
blockchain TEXT NOT NULL,
from_address TEXT NOT NULL,
to_address TEXT NOT NULL,
amount REAL NOT NULL,
token_symbol TEXT,
usd_value REAL,
timestamp TIMESTAMP NOT NULL,
detected_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
CREATE INDEX IF NOT EXISTS idx_whale_timestamp
ON whale_transactions(timestamp);
CREATE INDEX IF NOT EXISTS idx_whale_blockchain
ON whale_transactions(blockchain);
""",
down_sql="DROP TABLE IF EXISTS whale_transactions;"
))
# Migration 2: Add indices for performance
self.migrations.append(Migration(
version=2,
description="Add performance indices",
up_sql="""
CREATE INDEX IF NOT EXISTS idx_prices_symbol_timestamp
ON prices(symbol, timestamp);
CREATE INDEX IF NOT EXISTS idx_news_published_date
ON news(published_date DESC);
CREATE INDEX IF NOT EXISTS idx_analysis_symbol_timestamp
ON market_analysis(symbol, timestamp DESC);
""",
down_sql="""
DROP INDEX IF EXISTS idx_prices_symbol_timestamp;
DROP INDEX IF EXISTS idx_news_published_date;
DROP INDEX IF EXISTS idx_analysis_symbol_timestamp;
"""
))
# Migration 3: Add API key tracking
self.migrations.append(Migration(
version=3,
description="Add API key tracking table",
up_sql="""
CREATE TABLE IF NOT EXISTS api_key_usage (
id INTEGER PRIMARY KEY AUTOINCREMENT,
api_key_hash TEXT NOT NULL,
endpoint TEXT NOT NULL,
timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
response_time_ms INTEGER,
status_code INTEGER,
ip_address TEXT
);
CREATE INDEX IF NOT EXISTS idx_api_usage_timestamp
ON api_key_usage(timestamp);
CREATE INDEX IF NOT EXISTS idx_api_usage_key
ON api_key_usage(api_key_hash);
""",
down_sql="DROP TABLE IF EXISTS api_key_usage;"
))
# Migration 4: Add user queries metadata
self.migrations.append(Migration(
version=4,
description="Enhance user queries table with metadata",
up_sql="""
CREATE TABLE IF NOT EXISTS user_queries_v2 (
id INTEGER PRIMARY KEY AUTOINCREMENT,
query TEXT NOT NULL,
query_type TEXT,
result_count INTEGER,
execution_time_ms INTEGER,
user_id TEXT,
timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
-- Migrate old data if exists
INSERT INTO user_queries_v2 (query, result_count, timestamp)
SELECT query, result_count, timestamp
FROM user_queries
WHERE EXISTS (SELECT 1 FROM sqlite_master WHERE type='table' AND name='user_queries');
DROP TABLE IF EXISTS user_queries;
ALTER TABLE user_queries_v2 RENAME TO user_queries;
CREATE INDEX IF NOT EXISTS idx_user_queries_timestamp
ON user_queries(timestamp);
""",
down_sql="-- Cannot rollback data migration"
))
# Migration 5: Add caching metadata table
self.migrations.append(Migration(
version=5,
description="Add cache metadata table",
up_sql="""
CREATE TABLE IF NOT EXISTS cache_metadata (
cache_key TEXT PRIMARY KEY,
data_type TEXT NOT NULL,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
expires_at TIMESTAMP NOT NULL,
hit_count INTEGER DEFAULT 0,
size_bytes INTEGER
);
CREATE INDEX IF NOT EXISTS idx_cache_expires
ON cache_metadata(expires_at);
""",
down_sql="DROP TABLE IF EXISTS cache_metadata;"
))
logger.info(f"Registered {len(self.migrations)} migrations")
def get_current_version(self) -> int:
"""
Get current database schema version
Returns:
Current version number (0 if no migrations applied)
"""
try:
conn = sqlite3.connect(self.db_path)
cursor = conn.cursor()
cursor.execute(
"SELECT MAX(version) FROM schema_migrations"
)
result = cursor.fetchone()
conn.close()
return result[0] if result[0] is not None else 0
except Exception as e:
logger.error(f"Failed to get current version: {e}")
return 0
def get_pending_migrations(self) -> List[Migration]:
"""
Get list of pending migrations
Returns:
List of migrations not yet applied
"""
current_version = self.get_current_version()
return [
migration for migration in self.migrations
if migration.version > current_version
]
def apply_migration(self, migration: Migration) -> bool:
"""
Apply a single migration
Args:
migration: Migration to apply
Returns:
True if successful, False otherwise
"""
try:
start_time = datetime.now()
conn = sqlite3.connect(self.db_path)
cursor = conn.cursor()
# Execute migration SQL
cursor.executescript(migration.up_sql)
# Record migration
execution_time = int((datetime.now() - start_time).total_seconds() * 1000)
cursor.execute(
"""
INSERT INTO schema_migrations
(version, description, applied_at, execution_time_ms)
VALUES (?, ?, ?, ?)
""",
(
migration.version,
migration.description,
datetime.now(),
execution_time
)
)
conn.commit()
conn.close()
logger.info(
f"Applied migration {migration.version}: {migration.description} "
f"({execution_time}ms)"
)
return True
except Exception as e:
logger.error(
f"Failed to apply migration {migration.version}: {e}\n"
f"{traceback.format_exc()}"
)
return False
def migrate_to_latest(self) -> Tuple[bool, List[int]]:
"""
Apply all pending migrations
Returns:
Tuple of (success: bool, applied_versions: List[int])
"""
pending = self.get_pending_migrations()
if not pending:
logger.info("No pending migrations")
return True, []
logger.info(f"Applying {len(pending)} pending migrations...")
applied = []
for migration in pending:
if self.apply_migration(migration):
applied.append(migration.version)
else:
logger.error(f"Migration failed at version {migration.version}")
return False, applied
logger.info(f"Successfully applied {len(applied)} migrations")
return True, applied
def rollback_migration(self, version: int) -> bool:
"""
Rollback a specific migration
Args:
version: Migration version to rollback
Returns:
True if successful, False otherwise
"""
migration = next(
(m for m in self.migrations if m.version == version),
None
)
if not migration:
logger.error(f"Migration {version} not found")
return False
if not migration.down_sql:
logger.error(f"Migration {version} has no rollback SQL")
return False
try:
conn = sqlite3.connect(self.db_path)
cursor = conn.cursor()
# Execute rollback SQL
cursor.executescript(migration.down_sql)
# Remove migration record
cursor.execute(
"DELETE FROM schema_migrations WHERE version = ?",
(version,)
)
conn.commit()
conn.close()
logger.info(f"Rolled back migration {version}")
return True
except Exception as e:
logger.error(f"Failed to rollback migration {version}: {e}")
return False
def get_migration_history(self) -> List[Tuple[int, str, str]]:
"""
Get migration history
Returns:
List of (version, description, applied_at) tuples
"""
try:
conn = sqlite3.connect(self.db_path)
cursor = conn.cursor()
cursor.execute("""
SELECT version, description, applied_at
FROM schema_migrations
ORDER BY version
""")
history = cursor.fetchall()
conn.close()
return history
except Exception as e:
logger.error(f"Failed to get migration history: {e}")
return []
# ==================== CONVENIENCE FUNCTIONS ====================
def auto_migrate(db_path: str) -> bool:
"""
Automatically apply all pending migrations on startup
Args:
db_path: Path to database file
Returns:
True if all migrations applied successfully
"""
try:
manager = MigrationManager(db_path)
current = manager.get_current_version()
logger.info(f"Current schema version: {current}")
success, applied = manager.migrate_to_latest()
if success and applied:
logger.info(f"Database migrated to version {max(applied)}")
elif success:
logger.info("Database already at latest version")
else:
logger.error("Migration failed")
return success
except Exception as e:
logger.error(f"Auto-migration failed: {e}")
return False
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