Add from_slot example & note

[akegaviar]

Summary by CodeRabbit

• New Features

  • Added support for historical data replay via from_slot in subscriptions, enabling backfill from a recent past slot with clear retention/error behavior.

• Documentation

  • Added “Using from_slot for historical data” guidance with examples and caveats.
  • Expanded “Other subscriptions” with a historical replay example script.
  • Enhanced instruction decoding example for pump.fun create, detailing field parsing and account indexing.

• Tests/Examples

  • Introduced a runnable historical_replay_with_from_slot example demonstrating end-to-end usage.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Adds documentation for a new from_slot parameter in SubscribeRequest to enable historical replay/backfill, updates README with decoding example for pump.fun create instruction, and introduces a new learning example script demonstrating historical replay using from_slot against a Geyser gRPC endpoint.

Changes

Cohort / File(s)	Summary
Documentation updates README.md	Documents SubscribeRequest.from_slot semantics and usage, adds “Using from_slot for historical data,” references a new historical replay example, and expands Step 7 with a concrete instruction decoding example for pump.fun’s create instruction.
Historical replay example script learning-examples/historical_replay_with_from_slot.py	New async script demonstrating historical replay: reads GEYSER_ENDPOINT and GEYSER_API_TOKEN, establishes secure gRPC channel, determines current slot (Ping or brief subscription), computes from_slot, subscribes with from_slot, streams until near current slot, logs progress, and handles errors including “oldest available slot.”

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor User as User
  participant Script as Client Script
  participant Geyser as Geyser gRPC

  User->>Script: Run historical_replay_with_from_slot.py
  Script->>Geyser: Ping (optional) to get current slot
  alt Ping fails
    Script->>Geyser: Temporary Subscribe to infer current slot
    Geyser-->>Script: Current slot observed from stream
  else Ping succeeds
    Geyser-->>Script: Current slot
  end

  Script->>Script: Compute from_slot = current_slot - backshift
  note right of Script: from_slot starts stream at a historical slot

  Script->>Geyser: SubscribeRequest(from_slot, filters, commitment)
  alt Historical window available
    Geyser-->>Script: Stream historical responses
    loop Until near current_slot
      Script->>Script: Track first slot, count, progress
    end
    Script-->>User: Summary of covered slot range
  else Requested slot too old
    Geyser-->>Script: RpcError (oldest available slot in message)
    Script-->>User: Guidance with oldest available slot
  end

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

I hop through slots with whiskers high,
From past to near, events fly by.
A token, a ping, then streams unfold—
I nibble data, bytes of gold.
When history’s thin, I change my plot,
“Start here,” I thump—then off I trot!
(_/)> 🥕

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📥 Commits

Reviewing files that changed from the base of the PR and between c6fb70d and a2b1f5e.

📒 Files selected for processing (2)

• README.md (2 hunks)
• learning-examples/historical_replay_with_from_slot.py (1 hunks)

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🧪 Generate unit tests

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• Post copyable unit tests in a comment
• Commit unit tests in branch add-from-slot

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