feat(lending,oracle): events, oracle sanity checks, emergency pause, liquidation optimisation#68
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…liquidation optimisation - Add structured log event emission for all protocol actions (deposit, withdraw, borrow, repay, liquidate, flash_loan, accrue_interest, collect_protocol_fees, register_asset, set_collateral_enabled) using the log crate. Rejected operations emit warn-level events with the reason. - Add oracle price sanity checks: positive-price guard, per-asset absolute bounds (set_price_bounds), 50% deviation circuit-breaker, and staleness check (get_price_checked). Three new ProtocolError variants: OraclePriceStale, OraclePriceDeviationTooHigh, OraclePriceOutOfBounds. - Add emergency pause functionality. New pause()/unpause() admin-only methods block all user-facing operations (deposit, withdraw, borrow, repay, liquidate, flash_loan, set_collateral_enabled) while leaving admin operations available. is_paused() getter and ProtocolPaused error variant added. ProtocolSnapshot now includes paused field. - Optimise liquidation: replace full position() snapshot with lean health_check() (no map allocations), inline debt-burning to eliminate double accrue_interest call, merge collateral reserve mutations into a single pass, cap seize amount to available collateral before any state mutation, and add health_factor_after to LiquidationResult. Closes Kevin737866#39 Closes Kevin737866#40 Closes Kevin737866#41 Closes Kevin737866#43
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Add structured log event emission for all protocol actions (deposit,
withdraw, borrow, repay, liquidate, flash_loan, accrue_interest,
collect_protocol_fees, register_asset, set_collateral_enabled) using
the log crate. Rejected operations emit warn-level events with the reason.
Add oracle price sanity checks: positive-price guard, per-asset absolute
bounds (set_price_bounds), 50% deviation circuit-breaker, and staleness
check (get_price_checked). Three new ProtocolError variants:
OraclePriceStale, OraclePriceDeviationTooHigh, OraclePriceOutOfBounds.
Add emergency pause functionality. New pause()/unpause() admin-only
methods block all user-facing operations while leaving admin operations
available. is_paused() getter and ProtocolPaused error variant added.
ProtocolSnapshot now includes paused field.
Optimise liquidation: replace full position() snapshot with lean
health_check() (no map allocations), inline debt-burning to eliminate
double accrue_interest call, merge collateral reserve mutations into a
single pass, cap seize amount to available collateral before any state
mutation, and add health_factor_after to LiquidationResult.
Closes #39
Closes #40
Closes #41
Closes #42