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# Copyright (c) DataLab Platform Developers, BSD 3-Clause license, see LICENSE file.
"""
Signal I/O constants - especially for datetime metadata handling
"""
# Datetime metadata keys
# These keys are used to store datetime-related information in SignalObj.metadata
DATETIME_X_KEY = "x_datetime" # Boolean: True if x represents datetime data
DATETIME_X_FORMAT_KEY = "x_datetime_format" # String: format for display
# Time unit conversion factors (to seconds)
# Used to convert datetime values to float timestamps
TIME_UNIT_FACTORS = {
"ns": 1e-9, # nanoseconds
"us": 1e-6, # microseconds
"ms": 1e-3, # milliseconds
"s": 1.0, # seconds (base unit)
"min": 60.0, # minutes
"h": 3600.0, # hours
}
# Valid time units (ordered from smallest to largest)
VALID_TIME_UNITS = list(TIME_UNIT_FACTORS.keys())
# Default datetime format string
DEFAULT_DATETIME_FORMAT = "%Y-%m-%d %H:%M:%S"
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