What logical entities should be in the portfolio management system besides limits?

In a portfolio management system, besides limits, the following logical entities are usually present:

• Portfolio — a collection of financial instruments managed by a user or organization.
• Instruments (assets) — individual securities, currencies, commodities, etc., included in the portfolio.
• Transactions — operations of buying, selling, or transferring assets.
• Risks — parameters describing the riskiness of the portfolio or individual instruments (e.g., volatility, VaR).
• Returns — profit or loss indicators for the portfolio or instruments.
• Asset classification — categories to which instruments belong (stocks, bonds, derivatives).
• Management strategies — rules or algorithms for rebalancing and decision-making.
• Constraints and rules — besides limits, there may be rules for diversification, minimum/maximum shares, etc.

These entities help structure data and management logic of the portfolio, ensuring control, analysis, and optimization of investments.