/// Construct against a specific DB path. `skip_embedding_guard` bypasses

/// the startup model/dtype/dimensions drift check (used by

/// `re-embed`, which intentionally re-encodes at the new

/// config and rewrites the settings afterward). The model directory is

/// always resolved from config (Config::resolved_model_dir(), which

/// itself honors the --model-dir override) — it is not a constructor

/// parameter.

/// Throws std::invalid_argument if db_path is empty.

explicit RaggerMemory(const std::string& db_path,

bool skip_embedding_guard = false);

~RaggerMemory();

/// Store a memory. Stores to the configured DB.

/// `defer_embedding`: write embedding=NULL; caller (or startup) backfills.

std::string store(const std::string& text, json metadata = {},

bool defer_embedding = false);

/// Store a Level 5 RAG document chunk. Pass the same `chunk.imported_at`

/// for every chunk of one import so they share a single timestamp

/// (issue #48). Returns the new document id.

int store_document(const DocumentChunk& chunk, bool defer_embedding = false);

/// Capture a raw L1 conversation turn into the `turns` table. Empty

/// assistant_text → partial row (finalize later). `session_guid` groups

/// the turn under a session (empty leaves it NULL). Returns turn_id.

int store_turn(const std::string& user_text,

const std::string& assistant_text = "",

const std::string& model_name = "",

bool defer_embedding = false,

const std::string& session_guid = "",

const std::string& source_timestamp = "",

const std::string& session_name = "",

const std::string& name_source = "");

/// Finalize a partial turn (set assistant_text + embed + model).

bool finalize_turn(int turn_id,

const std::string& assistant_text,

const std::string& model_name = "");

/// Write back a document's embedding (import path).

bool update_document_embedding(int document_id, const std::vector<float>& emb);

/// Store a curated L6 decision/lesson. Embeds text unless deferred.

/// `status` defaults to "current" — the only status current_decisions()

/// (the recall-pipeline layer) actually surfaces. Other recognized

/// values: "roadmap" (planned/future work — deliberately excluded from

/// the recall layer so every session isn't cluttered with unfinished

/// plans; query it explicitly instead), "superseded", "deprecated".

int store_decision(const std::string& text,

const std::string& status = "current",

const std::string& tags = "",

const std::string& source_timestamp = "",

bool defer_embedding = false);

/// Per-row embedding write-back for the remaining context tables.

bool update_decision_embedding(int decision_id, const std::vector<float>& emb);

bool update_summary_embedding(int summary_id, const std::vector<float>& emb);

bool update_turn_embedding(int turn_id, const std::vector<float>& emb);

/// Purge conversation turns older than max_age_hours. Returns rows deleted.

int cleanup_old_conversations(float max_age_hours);

// --- summaries (L2/L3) pipeline (issue #22) ---

/// `source_timestamp` (non-empty) overrides the row's timestamp — L2

/// inherits the source turn's timestamp so the (session_id, timestamp)

/// pair links a turn to its summary (no FK column). `tags`="draft" marks

/// a heuristic-fallback summary that should be re-summarized later.

int store_summary(const std::string& text, const std::string& level,

const std::string& model_name = "",

const std::string& session_guid = "",

const std::string& source_timestamp = "",

const std::string& tags = "");

bool update_summary_text(int summary_id, const std::string& text,

const std::string& model_name = "");

std::vector<std::string> recent_summaries(const std::string& level, int limit);

std::vector<std::string> current_decisions(int limit);

/// Set a decision's status (e.g. promote "roadmap" -> "current" once

/// planned work is done, or mark a stale one "superseded"/"deprecated").

/// Returns false if no row matched.

bool set_decision_status(int decision_id, const std::string& status);

/// Decisions with the given status, most recent first. Use this for

/// anything other than the recall pipeline's "current" default —

/// e.g. status="roadmap" to list planned/future work explicitly.

std::vector<std::string> decisions_by_status(const std::string& status, int limit);

/// Exact-match idempotency check for bulk importers: does a summaries

/// row already exist with this text and created_at timestamp?

bool summary_exists_exact(const std::string& text, const std::string& created_at);

/// Exact-match idempotency check for the decisions table. Mirrors

/// summary_exists_exact.

bool decision_exists_exact(const std::string& text, const std::string& created_at);

/// Fuzzy overlap check for conversation importers: does a live-captured

/// turn already exist with this exact user_text within ±window_seconds?

bool turn_exists_fuzzy(const std::string& user_text, const std::string& ts,

int window_seconds);

/// Cross-source overlap lookup (ignores timestamp) — see

/// StorageBackend::find_turn_by_text.

std::optional<TurnRecord> find_turn_by_text(const std::string& user_text);

/// Upgrade an existing turn's timestamp/session_guid in place — see

/// StorageBackend::update_turn_meta.

bool update_turn_meta(int turn_id,

const std::string& timestamp = "",

const std::string& session_guid = "");

/// Replace text + metadata of an existing memory (re-embeds unless

/// `defer_embedding`, FTS5 triggers reindex, preserves id and original

/// timestamp). Returns false if the row is missing or has the keep tag.

bool update_text(int memory_id, const std::string& text, json metadata = {},

bool defer_embedding = false);

/// Search. Returns results from the single configured DB.

SearchResponse search(const std::string& query,

int limit = 5,

float min_score = 0.0f,

std::vector<std::string> collections = {});

/// Total count in the single DB.

int count() const;

/// Total rows across all five embedded tables (turns, turn_summaries,

/// summaries, decisions, documents) — the rebuild/backfill scope, and a

/// more accurate "how much is in here" figure than count() (summaries only).

int count_embeddable_rows() const;

/// Load all memories (for export). Optionally filter by collection.

std::vector<SearchResult> load_all(const std::string& collection = "");

/// Rebuild embeddings for all documents, or one table when `table` !=

/// "all". Returns row count.

/// `progress` writes a \r-updated counter to stdout — right for the CLI,

/// wrong for the daemon (it lands in the activity log as one enormous

/// line); daemon callers pass false and get periodic Logger lines instead.

int rebuild_embeddings(bool progress = true, const std::string& table = "all");

// ---- Embedding identity: current vs desired + re-embed control -------

struct EmbeddingStatus {

std::string current_model, current_vtype, current_engine;

int current_dims = 0;

std::string desired_model, desired_vtype, desired_engine;

int desired_dims = 0;

bool needs_update = false; // current != desired

bool reembedding = false; // an update is in progress

bool repair_pending = false; // a previous update was interrupted

};

/// Snapshot of current vs desired embedding identity, read from the

/// settings table (current) and config (desired).

EmbeddingStatus embedding_status();

/// True when no usable embedding model is loaded: new rows are stored with

/// a NULL embedding and search is keyword-only. Distinct from

/// embeddings_degraded(), which also covers a drift mismatch where the

/// model itself loads fine. Surfaced to agents via MCP because a log line

/// is not something the user will ever see.

bool embeddings_unavailable() const;

/// True when the embedding drift guard failed at startup — vectors are

/// unusable but FTS5 text + phonetic search still works. Log the error

/// and keep serving rather than refusing to start.

bool embeddings_degraded() const { return embeddings_degraded_; }

/// Re-check the embedding drift guard. If the stored settings now match

/// the config (e.g. after `ragger re-embed`), clear the

/// degraded flag, backfill any NULL embeddings, and re-enable semantic

/// search. Returns true if embeddings were recovered.

bool try_recover_embeddings();

/// True while a re-embed is running (search short-circuits on this).

bool is_reembedding();

/// Perform the staged re-embed: set the reembedding flag, re-encode every

/// row with an embedder for the DESIRED model, promote current := desired

/// in the settings table, swap the live embedder, then clear the flag.

/// Returns rows re-encoded. Throws on failure (flag is always cleared).

int update_embeddings();

/// True when a re-embed was interrupted and the remaining rows still

/// carry the previous model's vectors. Search degrades to text-only while

/// this is set, and housekeeping finishes the job.

bool repair_pending();

/// Finish an interrupted re-embed. Resumes rather than restarts: only rows

/// whose version byte is stale get re-encoded, using the identity that was

/// promoted before the interrupted run began. No-op unless repair_pending()

/// and no re-embed is currently running. Returns rows re-encoded.

int resume_interrupted_reembed();

/// Embed only rows whose embedding column is NULL. Returns count.

int backfill_embeddings();

/// Get distinct collection names.

std::vector<std::string> collections() const;

/// Delete a memory by ID.

bool delete_memory(int memory_id);

/// Delete multiple memories by ID.

int delete_batch(const std::vector<int>& memory_ids);

/// Search by metadata field matching.

std::vector<SearchResult> search_by_metadata(const json& metadata_filter, int limit = 0,

const std::string& after = "",

const std::string& before = "");

/// Session turns newest-first (recipe walk-back direction).

std::vector<TurnRecord> turns_by_session_desc(const std::string& session_guid,

int limit = 0);

/// Settings access (user_store).

std::optional<std::string> get_setting(const std::string& key);

void set_setting(const std::string& key, const std::string& value);

/// Access primary backend (internal — prefer RaggerMemory methods where possible).

StorageBackend* backend() { return backend_.get(); }

void close();

std::unique_ptr<Embedder> embedder_;

std::unique_ptr<StorageBackend> backend_;

std::unique_ptr<UserStore> user_store_; // settings and user management

bool embeddings_degraded_ = false;

#ifdef RAGGER_STATS

std::unique_ptr<class StatsLogger> stats_; // opt-in retrieval instrumentation

#endif

std::string kind;

std::string text;

std::string timestamp;

bool enabled;

std::string recipe_name;

std::vector<ContextChunk> chunks;