[Subtask] Import structured datasets (CSV/JSON) as graphs with attributes

[oxy86]

Overview

Add support for importing structured datasets (CSV, JSON) into SocNetV as graphs, including nodes, edges, and their attributes.

This extends existing import capabilities and enables users to construct graphs directly from tabular or structured data sources.

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Motivation

Users often have data in formats such as:

• CSV files (spreadsheets, exports from databases)
• JSON datasets (APIs, pipelines)

They need to:

• map structured data to graph structures
• import attributes at scale
• avoid manual graph construction

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Scope

Supported Inputs

• CSV (primary)
• JSON (secondary)

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Node Import

• define node identifier column
• optional label column
• additional columns → node attributes

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Edge Import

• define:
  • source column
  • target column
• optional:
  • weight column
  • relation/type column
• additional columns → edge attributes

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Behavior

• Users define mapping between columns and graph fields
• Imported attributes become part of:
  • [Feature Request] Custom Attributes for Nodes and Edges (Incl. Dates) #96 Attribute system
  • [Core] Node metadata system (import, storage, and usage) #130 Metadata system
• Resulting graph is fully usable in:
  • filtering ([Feature] Graph filtering, querying & subgraph extraction #215)
  • visualization ([Feature] Graph decluttering & focus visualization for large networks #209)

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UI Suggestions

• Import wizard:
  • file selection
  • column mapping
  • preview table
• Reuse concepts from:
  • node list import ([Subtask] Import node metadata from node list and external files #169)

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Implementation Notes

• Extend parser layer (WS4 roadmap)
• Reuse metadata import logic ([Subtask] Import node metadata from node list and external files #169)
• Ensure consistent attribute typing

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Edge Cases

• missing or duplicate node IDs
• inconsistent data types
• large files
• disconnected components

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Dependencies

• [Subtask] Import node metadata from node list and external files #169 Node metadata import
• [Feature Request] Custom Attributes for Nodes and Edges (Incl. Dates) #96 Attribute system
• [Core] Node metadata system (import, storage, and usage) #130 Node metadata system

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Relation to Feature

Part of:
#223 Graph data editing and structured data workflows